Unless you are competing, I doubt you need to change anything! A good rider on a heavy bike will still be a good rider, a novice on a featherweight will still ride like a novice (but probably break something in the process).
Many of us are developing bike bulimia, with some even developing genuine body weight problems to stay whippety.
Say you have a budget of £x to shave weight, why not use it for more diverse riding experiences too improve your skill instead? Go to that trail centre you’ve heard about or on holiday to (insert location here). Or even go on a skills course? Experience is a huge influencing factor to riding, I dare say significantly more so than equipment. I have no idea of your ability but everyone can improve somewhere.
It may appear heavy when you’re off it, but does it feel heavy when you ride? Would you really notice 500g difference?
I’m guilty of it too, but I think the proverbial princess has a very expensive pea under her mattress. (I’m not calling you a princess!)