Actually with me I have some trouble typing, and my weakened fingers just get tired after a few paragraphs. My own typing is usually using five or six fingers, converting to two when they need a rest. Also using the keyboard my text can be confused by some key left and or right. Ie. u, i and o, a and s, with e and r.
Also the hardest thing is concentrating and then constructing an argument or a logical progression and still type legibly and properly punctuate. Frankly, I instead think most typists are frankly not literarily disabled but technically or typing disabled.
As for this post, I know I have six or seven documents or e-mails to do, its 11.36 pm, and I want to be in bed by 12.30 am - yet if someone is worried I might say 'to' instead of 'too' or 'right' instead of 'write' - I have some questioning of why do I bother.
Sure I might like some of you guys, and I like to quickly converse with you, but if you like to worry on someone's grammar or their errors - well perhaps they might just do something else, or not contribute at all.
Another thing to some people who are contributing may have some kind of disability, either saying their type vocally (sight impaired), or have neurological problem (cerebral palsy, muscular dystrophy, etc,) or even have slightly impaired vision or age related limitations (say, arthritis, which comes to mind.) As you don't physically see the person, it is hard to paint others with exactly the same brush. Most might be lazy - some are not! Some cannot even get past the absolute terror of making some mistake and someone coming down on them - discouraging contributions any all. (I.e. There is a guy up the road from me who can't spell or write. He can create the most magnificent woodwork, and has classes at home to teach others how to do it. He'd be a brilliant resource on the internet or some blog site - but he wouldn't last a week even on nice really friendly sites like this one!)
As a further point, rather than just grammar are those who write two or three sentences and then say nothing. Most needlessly congratulate someone, and then don't say why or anything else. I.e. 13 of 27 (c.50%) here has three lines or less. Some one who writes say roughly 20 lines - has more chance of making mistakes. If they say something relevant - as long as there is 95% comprehension - frankly who cares - at least they bothered to be involved.
Anyway - my 2 cents worth...
(Actually 5 cents, as you can't get two cents anymore in change)
Oh dear, enough rabbeting. All I am now wondering about us how many spelling, grammatical and punctuation errors I've now made - let alone what I'm trying to say. The other is worrying that I'm being harsh or have inadvertently somehow offended someone (must not be so bold next time?)

(some mistakes here were maid deliberetely)
Note: What I also do personally hate is insincerity or irrelevant rambling that is not about the topic in hand - but that's off the topic.

) (i'm good at it)