You are missing the point and moving the goal posts.
First off, "all" BE coaches are not struggling.
Second, every coach has a down year here or there. Even the greatest. Look around the sport. Even in other conferences, some really good coaches are having tough seasons. To Bud's point, a downside of this portal era is having to integrate so many new players each season. If you miss in the portal, it can really impact your season, unless you figure out a way to adjust. And just like free agency in major sports, EVERYONE will miss in the portal at some point.
The difference is that when a great coach or even a consistently very good coach has a rough stretch or a down year, they aren't going to be subject to any significant level of criticism because of what they've done in the past. It is common sense.
If Danny Hurley or Pitino came here tomorrow, or even a Greg McDermott or Shaka Smart, (as 4 examples in the league). this board and our fan base would give them a longer leash because of what they've accomplished elsewhere.
I think Sha has done a solid job this season, so I'm not down on him as much as others. But part of the Sha discussion is what he's done over the past 4 years, not just last year or just this year. Four years, especially when you inherit a program that lived in the NCAA tournament for a half decade before and had some very good talent dropped at your feet, is a good sample size. That's what drives the criticisms, even from those who recognize he's done solid overall this year and understand the NIL world we live in (which, btw, he needed to after last season's debacle).