I guess battery life just doesn't matter to me so much. I put my 6s+ and 11 Pro Max on charger each night and they have no less than 80% of battery when I do - and that's usually because I used them a lot during the day.
It matters much more to people who use their phones as their sole device, or to consume media or play games, etc.
But…I sit here all day, every day. I see no need to use my phones for games or media. And this is just one (or two) of the computers I'm using every day.
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So, if updates cause shorter battery life I really wouldn't know I guess. I'm just using my devices as phones.