I don't use a spell checker (although I do break off and look words up in a dictionary if I'm not sure of the spelling) and I often go to the computer specifically to write an email. I prefer to type because I have arthritis in my hands and writing by hand hurts. It's also quite hard to keep my handwriting neat nowadays.
Also, if I have received news by email, it seems natural to reply by the same mode of communication. That's all it is: a mode of communication. What is communicated is up to the writer. Ditto for all other styles of communication. Moaning about one or ther form of communication is just, well, moaning. And unappreciative of the sender.
As for speed of communication making a difference to the sentiment. That's rubbish! One feels the sentiment immediately on hearing bad news (or good news).
Naturally, if what one has to say needs some consideration, one takes one's time composing the communication. That applies to all kinds of letter, not just had-written ones.
I think people are making all kinds of unjustified and unkind assumptions in saying one form is better than another. It is a very negative outlook.