Sure, it has a better art style but looking at the previous Yoshi game by Feel-Good, it is in the same tier in terms of commercial/critical reception as the "filler" titles like Kirby/Tennis/Party.
Maybe I'm remembering wrong, in a previous thread we had an argument over 2018s "filler" titles and I thought Octopath was included.
As well as artistically I'd also say it's technically and conceptually superior. Critically it may score similarly, but I rarely concur with reviewers.
Octopath definitely wasn't filler. It was a lower budget project and not my cup of tea, but it had a great sense of style and smartly emulated the 16-bit era of JRPGs that a lot of NES/SNES kids grew up with, putting a modern spin on a classic template. You could tell it was made with love.