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Why Charging Your Gadgets Over 80% Is Such a Bad Idea | iFixit News
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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.