I hate to repeat myself but here goes. Modify means change. It is unwise to assume that it means improve. This may happen and it may not. Like anything else, it is a gamble.
You might also try to keep in mind that even if the majority of us feel that a particular mod is an improvement, it may not suit your taste. And taste is the watchword here. We all experience things differently. Try to picture a thread arguing about the appropriate amount of salt to put in your soup. And arguments supported by analysis and measurements and testimonials and anecdotal personal experience. And the use of modified salt or salt substitute, etc., etc., etc.
Ultimately, I would hope, you season to your own taste.
Also good to realize that mods don't usually increase resale value. On the contrary, they generally disqualify a used product for me.
Oh, and by the way, the biggest variable in any system is your hearing. You perceive things differently from one time to the next. Most of the opinions I read concerning audio seem to emanate from the presumption that our hearing and interpretation are the fixed end of the equation when, in fact, they are the least consistent element in the chain.