Maybe that says more about your phone consumption than battery life.

I try not to buy a new phone every year and I can tell you, after 3-4 years, the batteries are very noticeably dying. My last two phones (nexus 4, moto z play) both were replaced due to failing batteries, since replacing them is almost impossible (I couldn't even find replacements that I would call trustworthy).

My usage was not super unusual, and most days I plugged them in over night and that's it.