I agree with you but I also think that calibre should have update patches instead of downloading and installing 100mb file every 2 weeks. Calibre comes with its own python it is mostly self contained so it would be great if we had a choice for downloading just an update patch. I don't think this is something Kovid has the time though he probably could do it. It's the same problem when he was not willing earlier to move to python 3 as the amount of man hours required vs maintaining Python2 for calibre himself was easier. But someone came along and started porting calibre to python 3 and Kovid used their help to move to python 3. So if a dev comes along with better way to update calibre Kovid will probably accept it but as it is not a priority for him he might not ever get around to doing it himself.