It's only Prime Video where just L1 isn't enough. My previous phone went back to L3 after an update, so I installed Custom Roms to get it back. They activate L1 on custom roms using some alternate technique, in which Netflix gave me Full HD playback, but Prime Video didn't. It used to play FHD on the Original ROM before the L1 broke.
Hotstar follows it too. Or atleast it did the last time I checked. When my phone went to L3, Hotstar was giving me only upto SD. Also, for some shows/movies it used to show same size for Medium & High quality when I tried to download. The size thing is true tho. The data consumption is huge even for SD content.