this might sound like a weird claim if you've a) never tried to pull a large software project off a website and build it from scratch, or b) do that all the time. but
it's a problem because it kind of undermines the concept of open source in a pretty basic way. for a lot of software, grabbing the thing and making it do what you want involves an indefinite amount of overcomplicated bullshit as you try to install the right versions of a bunch of dependencies you've never heard of and decipher output from an idiosyncratic build system. you can't just get in there and experiment
i think typically most projects don't see this as an issue, because nobody on the team has a problem with it, and if it gets brought up there are always historical reasons for why it's this way, and it's not THAT complicated, just follow the instructions dumbass,
@aeonofdiscord what's wrong with closed-source s/w? -- one has to study it with reverse-engineering tools, very slowly, and modifying it becomes a PITA open-source s/w does deny the four freedoms almost as well, just by other means