In the title the OP asks if it is worthwhile to upgrade speakers. I have 3 systems, a dedicated 2 channel, a basement man cave where I can do what I want with surround sound, and another surround system in our living room. I have the same WAF issues the OP has in the last system, and after experimenting with in wall speakers and other sonic compromises in living room, I decided it isn’t worth it. We don’t watch much in then the way of action films (no Marvel here) and dialogue is the key thing. So no need for Atmos or anything gimmicky there, but a lot of attention paid to voices and the center channel. When I listen to music in this system it is usually background while cooking or doing the taxes.
I should add that the living room is decent mid Fi equipment and still sounds better than most systems that I owned until I really got into audiophila about 25 years ago. Anthem Room Correction was a major upgrade