Just because it changes doesn't mean it's good.
A lot of people do Omen for card/det farming, that content is horrible because it's utterly static. If they rotated the monsters (and added a random lucky nm spawn) it would be far more fun.

If the drops are so "high quality," why do they need an upgrade? This makes no sense.
Because money drops are one thing, but progression is another that has far more attraction. Most players are not engaging at all with the +4 artificact gear upgrades from Limbus cause it's too long winded and they are barely upgrades, they barely even made the lower tiers easier to encourage it.

Only the really hardcore players are doing Limbus for upgrades, it's not doing what it was added to do (keep people busy).

I know asbolutely zero people who would quit if ambuscade was removed.
The only issue with it is it now lacks progression updates cause everyone capped, they need to add more. Which is what I said.