this might be devs' fault, but I find that there's an issue when installing requirements.txt with pip almost 100% of the time, sometimes it's a specified package not existing, often devs don't specify version numbers so everything will just install latest, meaning shit breaks. Those are just off the top of my head, there's more reasons that installing requirements is consistently retarded on python. I've found that python shit has like a 3 month shelf life before pip makes it a hassle to install.

in terms of virtual environments, there's just a bunch of shit that will reference dependencies on your bare machine, i.e. cuda. Which kind of defeats the purpose