How long will the battery continue to give you a 21 hour charge?
Things might have changed since the last non-mac laptop I used regularly, but right now I have a 2013 Macbook Pro on the original battery that I still find usable for several hours at a time. I've never known a laptop other than a Macbook that comes close to that. Like I said, my knowledge of the subject is limited and I would love illumination on widely available battery quality in the 2020s.
In other news, as it became apparent that my 2013 MBP was not really fit for primary use anymore I went back to a desktop for everyday and I actually love it. I still carry the MBP for remote work and just-in-case, but the HEDC is really, really nice (12 cores, of course), since most of my time is spent in the office anyway.