IMHO, the core series focused too heavily on maximizing the experience for esports, and that spoiled the genre for the mid-range gamers that were its bread and butter. And still, Dawn of War, Company of Heroes, Supreme Commander, Planetary Annihilation et al were not so long ago. And OpenRA itself has been somewhat of a success. BTW, C&C has a Red Alert reboot coming out before too long. It will be classic in design.
I would argue that they bifurcated into "optimized for esports" and "optimized for whale revenue".
I have played quite a few RTS-like games on mobile which were cool and neat and it was fun to optimize for not spending money. Of course, when whales get beat by players with skill, the whales get angry. So, the games optimize out skill except at the pro levels--which very quickly makes for a really crappy game experience for the rank and file.
> And still, Dawn of War, Company of Heroes, Supreme Commander, Planetary Annihilation et al were not so long ago.
Planetary Annihilation is an abomination that does not belong in that list. And PA is a prime example of trying to optimize for e-sports and forgetting that you need a decent game at the core.