Exactly. Even if they had gone and competed to satisfy the Russian tax payer or whatever AND medalled, you still would have found fault.
Nobody's blaming Chan for not going to Worlds to maintain 3 spots for Canada. Nobody's blaming the Shibs for not going to Worlds and getting the US 2 medals instead of 1 in ice dance. Nobody's blaming D/R for not going to Worlds to maintain 3 pairs spots. As mentioned before, many skaters opt not to compete at Worlds after the Olympics - which is often their goal and where they peak.
It's the first Worlds at the beginning of a quadrennial. There's plenty of time and opportunity for Russia to rebuild in ice dance prior to the 2022 Olympics.
I highly disagree that Russia hasn't learned IJS either. S/B had two level 3's and Z/G had one level 3 in their FD, and only one level 3 in their SD, which shows they're nearly there as far as getting their technical up to snuff (note that only one team - H/D - had perfect levels across the SD & FD). Artistically, I don't know what you mean "ice dance is supposed to be"... the great thing about ice dance is that there's room for a variety of flavours and programs. If everyone tried to do lyrical contemporary a la the French team, it would end up losing that variety.