That's because it's not really a "video website", it's more like a patreon for video creators.
Floatplane has made a very conscious decision not to influence the user's decisions on consuming content; there's no algorithm, recommended videos, or trending page. you just have access to the videos of people you want to support.
I see there's still a lot of confusion regarding what Floatplane actually is; It's not a video platform in the traditional sense, instead it's a platform for supporting your favorite video creators, while getting access cool perks (no ads, higher video quality, exclusive content ...etc)
there's no algorithm, recommended videos, or trending page.
In that sense -as others have mentioned-, it's functionality much closer to a 'Video Patreon' than it is to say, a youtube alternative (AAMOF they've explicitly mentioned that several times)
When seen through that lens, it becomes apparent that "looking good" isn't really all that relevant, I mean, would the way patreon looks prevent you from supporting your favorite creator? probably not.
PS: Of course I get that good UI/UX is a must these days, my point is that they probably have much higher priority (not to mention mission-critical) tasks on their to-do list right now.
Floatplane has made a very conscious decision not to influence the user's decisions on consuming content; there's no algorithm, recommended videos, or trending page. you just have access to the videos of people you want to support.