are you honestly declaring "someone with a vested interest in getting you to spend money decides what's new" as if it's some hitherto never expressed genius philosophy 😂
next you'll be patronisingly explaining "you do know trends are all made up by fashion designers, don't you?"
I don't think anyone assumes that new trends magically emerge out of thin air into the general consciousness. Of course it's all engineered to get people to spend more money - just like literally every other form of entertainment, media, decoration and consumerism.
There's a difference between worrying about things being dated and refusing to accept it as a concept. If you don't care about your clothes being bang up to date, great, good for you, carry on.
But pretending that not caring about what's in fashion and just wearing what you like, is some sort of novel concept that only you are clever and superior enough to adopt, rather than something most of the population does to some degree or another, and insulting anyone who does have an interest as being 'a sheep' is pretty ridiculous and unpleasant behaviour.
And as for your other point, OED literally lists 'styles' as a synonym for 'trends' so....