Diki,
Yep, You are right..BUT, we want a new arranger or whatever because we like the new better sounds & styles, it's FUN!
Don't you like to have fun with a new instrument?

In a way it does make you a better player because you are more INSPIRED!

If the voices sound better and more real, and the styles wrk better with a song, it's more fun to play that song...because it does sound better. Repeat, it does sound better.

Will it bring you up to a much higher level of skill, NOT, but it may ispire to be better and practice more.

That's mu 2 cents worth, based on 45 years of playing and buying instruments.

Lee S.