I have been listening to old recordings of sing-alongs. It wasnt too low for me as a tenor. Today many people sing too low for me. I am thinking of music from older movies.I actually like this key. It works well for tenors. It is not too low. It is often too low when I try to sing with people today. Did people sing higher before? And if so what was the reason for it?
Perhaps I (and Cheddar) can be of assistance.
Essentially, this video covers how the invention of the microphone influenced the early 20th century music/recording industry and how it changed the music being produced, including the shift in popularity from tenors-only to more baritone/bass voices.
Namely, male singers had to sing higher to be recorded, but with the microphone, they didn't need to have high voices to be heard.