We used to have earbuds that don't need to be charged because they had a headphone jack, didn't get lost so easily because they had a cord attached to a headphone jack, never lost the bluetooth connection because they had a headphone jack, and they cost less because they had a headphone jack. https://bsky.app/profile/daisyfm.bsky.social/post/3l3mfjc6sn62k
Yes it does because no manufacturer claims the lifespan in years, they say you get 2000 charging cycles. The 5 year number is derived from 2000 / 365 = 5.48 and that assumes you are charging them fully every day.
Look buddy, I'm not a battery expert and I can tell you aren't either. You can't get an easy number because the chemistry is complex and the way you use them changes things. When you do get a nice clean year number it depends on many things so making broad proclamations isn't very useful.