Can you say "much ado about nothing" boys and girls?
In a forum for a phone with a sealed battery, this can become a very serious, and somewhat important, question.
Newer Lithium tech is a lot more durable than those of older pedigree, but they still suffer small amounts of damage from misuse and smaller amounts of damage from "normal" use (fully charging, discharging to shutdown, all of these things do very tiny amounts of capacity damage).
And with smartphones approaching the thousand dollar range, it's a fairly serious thing to consider. A 20% loss in capacity, which is a perfectly normal thing to have happen over a year or so, could turn your all-day smartphone into something you need to charge mid-day. And for some, that means needing to change the battery out to get their day out of it again. Except with a sealed battery, you can't.
So for something with a glued-in battery, the question "does recharging this to 100% overnight every night result in an additional loss of capacity above and beyond normal wear and tear" is a very serious one. And with the dizzying arrays of technology and charging patterns that mean different answers to that question for each phone, I'm relieved to say, "who the heck cares? Enjoy your device, and in a year, buy a $20 battery."