A:AnswerNo, and I’d recommend not replacing the key caps because you will loose track of where all your fn keys are due to the fact the key caps razor sells don’t have them labeled.
A:AnswerAs with anything mechanical, the switches may breakdown after use.
I have an old Razer keyboard, probably about 5 years old now, every key works fine, the letters are worn out on the heavy use keys but other than that I've not had issues.
A:AnswerIf you have a second keyboard, you can use that as a primary keyboard, and use the damaged one for specific hot keys, I have a Blackwidow V3 that I use for my stream hot keys and for discord