Counterpoint (for most likely a bot post lmao): internet for people can be dodgy and feeds can cut out intermittently and capture direct on console maxes out at 1 hour, which gives 1 point back to capture cards since local recording would save a run with intermittent internet. On top of that, having a capture card allows people to actually show timer on screen through programs like OBS which can be an important thing for load removed times without having to play back the run a second time. Then there's the obvious issue of older consoles that don't have these capabilities and that's all I really need to say.
Made this thread cuz noone else has anything like it (and still noone has), not coming from a place of expertise but more just a general compilation of community thoughts/knowldge built on what people have sent through this thread/DMs. The only stuff I can truly talk about/reccomend from experience are HDMI and 3DS capture cards. This thread should be a good place to start for most people looking into capture cards however imo instead of starting from nothing (as discussed somewhere around page 2, 3 years ago). I do think the disclaimer contains enough warnings for people as well.
if someone else makes a thread with tons of research or something instead of something compiling community thoughts with minor checks, please feel free to pin it over this forum post, I'd love to see that happen.