And I can definitely say just how bad it is because my iPad Pro M2 was replaced after screen issues 3 months ago so it has a basically brand new battery, and I had my battery replaced in my iPhone 14 Pro not a month ago (and they exploded my phone so I have a replacement). After upgrading to version 26 I thought it was bad at first, but I have literally such worse battery life than I did with my phone which was down to 80% efficiency on the battery!
Without walking and using the GPS my phone is down to 30 percent by 3:47 PM! And this happens every day!
And my iPad Pro with almost no use is down to 70 when with the old battery would have been at 96%..
And I am sure half of it is from the awful transparency that makes everything look illegible, and constantly glitches and takes a while to redraw as most things show up transparent.
And hopefully 26.1 which will allow you to limit transparency will bring some efficiency back, but likely this is mostly bad coding!
My pet peace’s in an OS are making things less efficient (more steps to do the same things),, less legible (say with transparency, and running slower with each OS release! And these OS’s do all of these in spades!