I think the idea that the level was *** that year has been rebuked by the events of the past 12 months.
Ultimately, it depends on the race situation. Right now, Thomas, TGH and Roglic are basically on the same time, so ideally Roglic is narrowly the strongest of the three (or Evenepoel makes a miraculous recovery) so that Ineos both can and needs to race aggressively. For all Ineos' faults, when they have been in behind-but-winnable positions in GTs, they've always gone for it, whether on Stelvio and Sestrière in that Giro, Iséran in the 2019 Tour, or Finestre in the 2018 Giro. Don't see why they wouldn't do the same this time.