Does anyone else want a bit more stability?

I know this is a fast paced game but it seems so many times after I figure out the masteries and builds I want on a champion, it all goes to waste after some massive changes. It's even more radical for junglers. I'll give you a recent example in Zilean. Before the latest round of Thunderlord's nerfs, I was sure it was the mastery I wanted. A week later, the time to stack it is decreased from 5 seconds to 3 making it extremely difficult to apply at all with Zilean since his bomb timer is 3 seconds itself. To elaborate, I liked to play AP Kog a lot and then he gets reworked and the whole poke style I was using doesn't seem effective at all anymore. I used to play Gragas and he was insanely fun, then he gets nerfed like a million straight times and I just can't perform well on him anymore. He has something like a 44% winrate.

I understand balance changes and all that but it feels like it's a never-endless cycle of FoTM and what is strong/viable. It's pretty frustrating that I can't just play the champs. I like and perform decently regardless of the changes to the game. I also don't understand how eSports is supposed to function if the foundation is constantly shifting. If you look at any other sport, there are never so many huge changes. It's no wonder LCS pros tend to have such short careers. The champions they practice and like can be unviable next month. Look at Azir. Getting good at this game or a champion seems rather futile unless you're constantly spending hours on end to follow the trends/changes.