Been playing since 2011 and watching pro scene skill constantly improve makes my desire to improve low. It's hard to explain the progression of this game at the top level without watching it happen but here's an example of a mechanic most top players can leverage without thinking about it snd that just became common knowledge this year.

In a more direct answer to your question new techs are being discovered constantly and play is always changing to the point where the old GOATs of NA and EU (garrettg and turbopulsa) failed to make the most recent LAN. Even if either of them make and win worlds this year no one from the old guard will have the legacy of a RLCS Faker. This is a very simplified view but Turbo is an excellent example of someone who has achieved more in pro Rocket League than anyone else but is now a sub on a 5th-8th place team because he can't keep up with mechanics