The bad drafts didn't start in 2021. It was an open secret in the league that the Pats have been having ****ty drafts from 2014-2015 at least. They won a bunch of SB's off a strong of good drafting they did from 09-13 that loaded the team with hallmark talent (Chung, Vollmer, Edelman, McCourty, Gronk, Spikes, Solder, Vereen, Ridley, Cannon, Jones, Hightower, Collins, Ryan, Harmon). And even before they won SB's they got Hernandez who was basically a top tier TE in the league in that period of drafting as well.
Also 7 of those guys were drafted in the first two rounds.
From 2014 to 2020, the only notable players they were basically burning their top picks. Sony Michel was the biggest success story of a top pick and he really only was notable because he turned it on for one playoff run, aside from that at the tail end before the collab started in 2020 he did get Uche and Dugger at the top, but again, that's two guys they got with preemium picks in 6 years and they were just solid, not world beaters people will remember like a lot of the guys from 09-13.... and again 2 guys in 6 years that spent a decent amount of time as solid starters with your best picks.
Then in the lower rounds White and Thuney were the only guys I'd consider top tier contributors that played here and made a big difference from 2014-2020. Which yeah they are good, but that's not a lot of hits.
The collaboration was not the problem. The problem was they took a nose drafting well before that and the collaboration didn't fix it.
They did much better getting free agents than drafting which is what helped them and 2021 was a year they got an influx. But it's not sustainable.