Omicron deficit & rushing new characters VS. “completing” existing ones?

(Context: 13M GP, have every character, most at R5+. Missing 9 important GAC omis (including DRey's), 30-35 TW omis, and pretty much every TB omi. In a great guild with decent TW win rate and 43* ROTE.)

"Keeping up with the latest character/team release" has become more restrictive over the years, especially with the trend of triple-omicron characters.

The question I find myself asking is: would those 3 omis with each new release be better invested in older characters/teams that are already built and operational? Or for the sake of competitiveness, is it always better to prioritize the newest team?

Has anyone else experimented with "pausing" the pursuit of new characters, and strictly going back and filling in the gaps in important TW/TB omis? If so, I'd be curious to hear how it's gone for you and if you regret the decision or not.