I always put printers (2d and 3d) behind a firewall so they cannot reach the internet. This prevents auto-updates and surprises like disappearing functionality.
I've been bitten by an HP printer auto updating and my aftermarket ink suddenly not being acceptable. Never buying HP again after that.
Which means the controversy in question would not apply to you whatsoever.
that's what I had in my mind - I want to switch back to HP printer because the Brother I bought has inferior picture printing quality, but I am scared of any software update, so I guess I'll connect it to old linux machine and serve via CUPS
In the case of Bambu you'd want to do this to prevent surprises like your printer from randomly starting to print due to a "cloud error".
https://www.techradar.com/pro/did-your-3d-printer-start-prin...