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From my experience iPad battery health tends to drop more quickly compared to iphone but it will stabilize after some time. For exemple, all of my iPads go down to around ~85% in a year or so and then it will stick to that number for like the next 3-4 years.
Apple has to avoid the “below 80% warranty replacement” cost somehow.
 
M4 13" since launch May 2024. Just dropped to 90% some cycles ago. 637 cycles.
(have had 80% charge limit on since day 1, guess that works well? 10% in 2+ years with I'd say fairly heavy usage (mostly youtube/VLC but a lot of it))
 
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Just passed 600 charge cycles.

Battery health seems to have settled at 88%.

Granted, there is the eternal question of how accurate / honest Apple's own battery health metrics are, but it does seem that 80% charging does help with the overall longevity of your battery.
 
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Battery health at 95% after 251 charge cycles. Not using the 80% charge limit. I charge it right up to 100% every time.
 
Just two days after my last post, battery health drops 1% to 97% with 151 cycles on my 11" eSIM version.
 
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