For now, Rumble will remain far more niche - it does not have the resources to be competitive with Youtube even in terms of UI, etc. But it will keep improving as it grows.
Considering every new YouTube UI enhancement has been user hostile for a while (downvotes, search, order by age, playlists), the lack of "enhancement" for Rumble can only be seen as a good thing.
For now, Rumble will remain far more niche - it does not have the resources to be competitive with Youtube even in terms of UI, etc. But it will keep improving as it grows.
Considering every new YouTube UI enhancement has been user hostile for a while (downvotes, search, order by age, playlists), the lack of "enhancement" for Rumble can only be seen as a good thing.