You might want to ask Anders in his form since he is the Acoustic course instructor.

https://www.guitartricks.com/forum/c/51

My advice would be to consider your goals.  If you can play the music you want with the technique you currently have, then keep using it.  If however you come across a piece of music that requires you to adjust your technique, then it might be useful to develop your thumb independence.

I was in a similar position a few years ago.   I'd spent about 25 years developing my fingerpicking technique mostly aimed at playing classical style.  But, then I heard some Travis picking pieces that I really liked enough to dig into that style.  I could only get so far with my established technique, so I spent a few months slowly working on the motions specific to Travis style with the thumb independence.  Maybe 15-20 minutes a day just doing basic drills.  I'll probably never get too far with it & it won't ever be as developed as my other playing in other styles!  But it was fun & satisfying to add a little bit of that style to my repertoire & play a few tunes.

So, it might be worth it.  But it really depends on how much time you have to devote to it.

Hope that helps!