I can't give you sources or scientific evidence but I can give you my top 3 reasons apart of the obvious:
- no Ads and corporate accounts (At this point in time)
- less but better content + conversations
- it's more healthy for my brain... less rage- and clickbait or Self-playing videos
To be fair these will all be gone when there is more popularity
Have you tried one of the google search alternatives?
Of course they can not compensate for the shithole the whole internet has become