2011 Giants - Victor Cruz was their best receiver, and he was a slot guy
2012 Ravens - Anquan Boldin was their best receiver, and he was a possession guy
2013 Seahawks - Golden Tate was their best receiver, and he was a possession/slot guy
2014 Patriots - Rob Gronkowski was their best receiver, and he was a tight end (a great one though). Or go Edelman, more of a slot guy.
2015 Broncos - Demariyus Thomas was their best receiver, but was he a true #1? Only 6 TD all year.
2016 Patriots - Again, Edelman.
2017 Eagles - Nelson Agholor was their best receiver, who you already just said is useless.
2018 Patriots - Edelman.
2019 Chiefs - Either Tyreek (great) or Kelce (great, but a TE).
2020 Bucs - Mike Evans, who's really good, but even he only had 70 receptions.
2021 Rams - Cooper Kupp, who obviously is phenomenal.
Of those 11 most recent SB winners, I'd say that just 3 - Chiefs, Bucs, Rams - had true #1 stud receivers. Now, they also happen to be the three most recent SB winners, so maybe that's how the league is going. But for the most part, recent SB winners didn't have the stud #1 WRs.
Sure, if you're focused on one game. I don't personally define success by "Win a Super Bowl or not." Or I guess, in the case of the Broncos, I should have prefaced it with "Alternatively, you can have an all world defense that cleans up the mistakes your offense makes," but I don't need to. Demaryius Thomas is the epitome of a #1 receiver at the time. It wasn't his fault Peyton Manning had a noodle for an arm at that point.
Let's look at who those teams played in the Super Bowl:
2011: Pats: Welker, Gronk and Aaron Hernandez (and the GOAT throwing the ball). No true outside #1, but you don't need one with those other guys. The current Pats don't have a single guy that could lift any of their jock straps. So, I'll grant you, if Mac Jones has Gronk, Welker and Hernandez in their prime, he wouldn't need a true outside #1.
2012: SF, a prime Crabtree, Vernon Davis who lit it up, and well, Frank Gore (and a running QB)
2013: Denver: DT, Welker, Eric Decker, Julius Thomas.
2014: Seattle; No #1, which is why they should have run the ball. Instead, Malcolm.
2015: Carolina, No real #1, but had Olson, and of course, Cam running the ball all over the place.
Now, let's move into more of the present day game:
2016: Atlanta: Julio
2017: Pats: Gronk, Cooks, GOAT (and James White)
2018: Rams: Cooks, Woods, and that guy, Gurley
2019: Niners: Deebo, Kittle
2020: KC: Obviously Hill, Kelce, etc.
2021: Bengals: Chase, Boyd, etc.
If you want to change it and say they don't need a #1 outside threat, fine, but you need some explosive skill position players. Right now, the Pats offense has 2 above average players at their position on offense, maybe. And they are both running backs. Nobody in the receiving corps is a top 2 wide receiver for a contender in this league.
Folks can blame Mac all they want, but he's got no offensive line, and even if they do give him time, it's a cold day in Foxboro when one of those receivers is going to beat a defender 30+ yards down the field. You need speed at the skill positions in the NFL in 2022, and the Pats have almost none of it.