Drafting has been horrible for several years. We also have aging players on high end contracts. Some of it is bad luck, but most is just bad team building. To have no succession plan at QB at all with Brady playing until age 42 is really hard to believe for someone like Bill.
Horrible is a strong word. They haven't hit on enough players but I'm not sure that makes the drafting "horrible". Bad team building ... yeah, I don't think so. You seem to be chalking up their roster issues this year to Belichick and nothing/no one else. A fair, objective person, would not all the variables present. COVID, opt-outs, dead money/cap issues. And yes, to an extent, the drafting.
What would your succession plan at QB have been? Who would you have drafted, when, and where? Which FA would you have targeted? You can't just whip up a succession plan out of thin air, especially during a completely abnormal, wacky season, missing core players and without any cap space.
Look, I get your allegiance is to Brady before the Patriots or Belichick. I don't know any sane Patriots' fan that would complain about Belichick's performance to date over the last 20 years. Has he made mistakes? Yes. So has every other coach/GM in the history of the game, even the most successful ones.
If you want to use this one season as your barometer and declare Belichick is useless (despite the past 20 years of evidence), go ahead. But most Patriots' fan I know would not be tossing Belichick to the curb based on 14 games in a vacuum. Hell, even an objective observer with no dog in the fight would note that 14 games is not enough time to reach any conclusions about the post-Brady era ... and they'd almost certainly acknowledge the unfortunate circumstances surrounding this season.
The drafting has been poor at times, but beyond that, I'm not sure what there really is to complain about.