My main problem with third person perspective when it comes to games like that is that it feels way too restrictive and limiting when it comes to interacting with your environment. Having two perspectives to switch between seems like a good idea in theory, but in practice usually you can clearly see which one is obviously favored by the developer, meaning the other feels just tacked on (for example look at Bethesda games). So if they focus on first person perspective, it means that playing in third person perspective will be only valid for walking around, while most of the interactions will be handled in first person anyway. On the other hand focusing on TPP means that, as I said earlier, interaction with environment will be far more limited, which will carry on FPP mode as well. Which is why I would ultimately prefer FPP mode exclusively for being most beneficial for the experience.
As for "looking at yourself" bit, there are many other opportunities you can have for that, even without third person perspective like inventory menu, mirrors, water puddles, dialogues and cutscenes. I mean Kingdom Come did just that and I don't think anyone complained about not being able to see your character all the time.