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I would hope for average battery-charging software / logic to be better; to not recharge obtrusively when not really needed... (though this might involve a setting or two; still, probably less "taxing" than something so scary as manipulating a battery, for most users)
Overall, having a built-in UPS is too nice to abandon (and again, in a "desktop replacement" normally working off the mains, the battery doesn't need to be obtrusively topped-up at every opportunity)
PS. Funny thing with diesels, they actually scale exceptionally well their fuel usage down, when only fraction of their total power output is required or when idle. Yeah, people could stop being almost prejudiced about them.