If you want another sad-making observation, the teachers say teens are increasingly finding late-20th-century kids' books hard to read, because the language is too complex for them to follow—they're used to first-person with very simple sentences with redundancy for anything important (so it's harder to miss), and publishers are chasing simplicity/clarity-at-all-costs hard for fear of alienating any of their shrinking reader-base, which of course re-enforces that decline in ability to handle sentence- and paragraph-level complexity—even goes for "advanced" readers, I'm told. This part's been heading that way for a while, but I guess has gotten much worse fast over the last 5ish years.
Basically, the genres that people still read (YA and romance) are trending hard toward first-person and very simple language. If you write in third publishers and agents will either tell you to switch outright, or you'll get a lot of "seems too distant and impersonal" and such, which is just them asking for first person without saying it. Some get through anyway, especially from authors who got their start 10+ years ago and have more sway, but first is strongly preferred.