It's a weird path. I do think the avoidance of a slow burn is an intentional reaction to the poor reception of Phase 4.
Will they recast Doom after this? Seems like you couldn't as you've set TS up as DD. They could have had variant Tony be the villain without being DD. That's a waste of the long term potential of DD, but it makes sense if they aren't dragging the Avengers out past this. And DD has been the villain of all 3 live action movies already. So it makes sense to avoid him for MCU FF sequels.
So, go for broke with 2 more Avengers movies, then reboot via it into an Xmen franchise, with cameos from this era only.