I think they are a great addition for the short 1 minute ideas some youtubers have that may as well be posted on their 2nd channel.
Imo it could be improved with a landscape option and longer than 1min vids.
Idk really. At that point it would be like a regular video.
But YT treats shorts differently so idk what the upsides (currently) are on the creator side.
And if they are beneficiary for the creator in regards to <1min content, why not give them the option of uploading in landscape. The more options the merrier?
The "benefit" is on the user's side. They know they'll be able to interact with a single hand and no need to mess with orientation and all that useless junk. Plus they know they don't need to commit to a horrifying 5 minute long video. (They just happen to sit there scrolling for several hours anyway.)