I get why there are people that don’t like how some installers do this, but this trope is really turning into the “but I don’t even own a TV” of OSS commentary.
Just use the Docker image if you don’t like it. Or get their appliance which actually supports ongoing development.
Frankly, being anything other than super paranoid is almost a little reckless.
Also, shit-talking Home Assistant is a pretty weird take. I wouldn't write it in Python configured half in YAML and half in SQLite either, but ... not having to write it myself was the fun part.
Anyone who really complains about curl | sudo is just doing it for nerd points, because I guarantee you they happily install all sorts of other software without "vetting" it.
And if someone caught someone doing trickery it'd be big news.
If I don't trust the website to do curl | sudo bash then why do I trust the software that I would eventually install?
Even the old argument of "middleware devices modified the script en-route" is mostly removed by HTTPS everywhere.
And there are people like you who actually look at the script (and the compiled code, too!) to find things, because if they do find something in a script as big as HomeAssitant, they'll be famous.