Thank you for the details! That's probably the best all-rounded explanation I've seen for what's going on with our laptops, that it's a generalized hardware defect and nothing else, and why it's actually so hard to do anyhing about it by yourself.
@garg18 I tried your fi- on my TUF Dash F15 and I'm afraid it didn't work, as you unfortunately seem to have discovered. Right now I can only type "s" because I rebound the Armoury Crate key to that character, and the keys for the letters missing in ...