There's some big stuff in AUR like the binary VS Code and Chrome, fwiw.
Btw the official “vscode on Linux” instructions literally point to the community maintained AUR (same for nix).
The truth of the matter is the AUR is poorly maintained structurally, regardless of what companies officially support. Things like letting arbitrary people unilaterally take over orphaned packages is horrendously stupid.
“Learning from your mistakes is good. Learning from the mistakes of others is better”.
For all its flaws, at least Cargo attempts to do that. AUR does not. No other package manager this regularly has hijacking problems.