Well, I'm a bit late but I wanted to reply to the thread anyway.
First off, I want to say my virginity level is over 9000, to the point of me never having been in a relationship or shared a kiss. So I'm just assuming this is how things would turn out, without much to base those assumptions on. That aside, Rin is definitely my favorite character and I don't even feel like playing any other routes after finishing hers :/
Now, without considering the disabilities (as OP put the question), I think I could make it work. I don't see her as too difficult to deal with, honestly I don't know why it was so difficult for Hisao. She really isn't as bad with words as she thinks, and a lot of what she says makes sense. I'm not much of a talker myself anyway, and I don't think I would try to force a conversation out of her every time like Hisao did. I'd rather just spend our time together, whether it be doing something or doing nothing. I also love how she thinks about stuff in an unconventional way, and the occasional philosophical ideas she discusses are fun to think about. It would probably be more of a problem for her to deal with me, to be honest.
I'm not much into lying on the ground and staring at the sky for hours on end and sitting at a festival doing nothing for the whole day, and usually unproductive days make me feel really terrible. But I think it's not a bad thing that Rin can be so carefree, and it would be something I'd like to learn how to do myself. Maybe I could become the best cloud watcher in the world, I've never tried it before, so who knows, maybe it's just the right thing for me
Something that might be hard for me to adapt to, though, is her constant painting. I like art and it's fun to look at, but just like Hisao, I don't really understand it. I guess no one does, people interpret it, but I don't think that's too interesting. I like art that makes me feel something when I look at it, but I don't try to think about what the piece means to me or what it could mean to the artist. It's also kind of crummy that Rin would spend so much time painting, since it requires a lot of concentration for her, which means I can't enjoy being with her as much when she is painting. When she was working at the atelier, Hisao had to pretty much spend all of his time sitting on the couch and reading a book. I'd probably have to do the same.
It's fine if it's a month or two of her preparing for an exhibition, but she would probably paint for hours every single day, and that would be a tad bothersome. Or maybe she wouldn't, in the beginning of the game she was procrastinating a lot on her mural. I guess she only paints with such dedication when she is striving towards a set goal, like the exhibition. So maybe it would be alright. In any case, I guess I could learn to draw myself if it got really bad. Always wanted to try art but I never had enough motivation, and it requires a shitton of effort for someone like me, who is logical and has zero experience with art. I even was impressed by that sketch of a bird Hisao did in class once. Would take me months to get to that level. If Rin was there, maybe it would provide enough motivation for me to really get into it.
Although, it wouldn't really be helpful in dealing with her to learn art anyway. Nomiya understands it but it doesn't help him at all in understanding Rin. I wonder, as Sae said, everyone interprets art differently, which means it's a bad medium to communicate your feelings through and get other people to understand you, is it not? Does that mean Rin was wasting her time when she was trying to make people understand her through her art? I guess that's why in the good ending, Hisao starts to somewhat understand Rin without the help of art.
Hmm, and then there is the situation where Rin still has her disability and whether I could make a relationship work with that in mind. Everything still remains the same as I think I could come to terms with it pretty quickly, but there was one post where someone emphasized the first meeting as important.. and I agree. I think if I was just in the same class as Rin or something I might not try to meet her because of her disability. It would probably be just a little off-putting enough to where I would feel awkward starting a conversation with her. (Though, I guess this is true for me with anyone, even if they don't have a disability. But moreso with someone who has no arms, I would imagine. What if I blurt something stupid out? What if I stare too much?) However if our first meeting was like in the VN, where she was alone in an empty classroom and I had to ask where the supplies were, it would probably work out fine, since you can tell pretty quickly she doesn't feel insecure about her disability.
Just pointing out that 'being playful' and 'being serious' sometimes do have overlap… and yes, I agree with you.