I spit my drink out reading the thread title. Most Japanese 3rd party devs are already supporting the system with ports. Bethesda is the only western 3rd party dev worth a damn anymore, and they're giving Switch good support.
I dunno about Bethesda? Based on which metric? Your personal preferences?
Bethesda wasn't on my map before they entered the Switch. I got Doom out of interest how it compares to classical Doom (it's completely different, not only because of graphics, but gameplay is much faster) and Skyrim because I assumed it might appeal to me (it does).
But going after overall sales, revenue, number of releases or stuff like that, than obviously EA, Ubisoft, Activision and Warner all matter more than Bethesda.