My Pixel 2 battery isn't what it was either, but for my use, it's enough - and I don't see anything even in the 5, that makes me want to spend money.
That said, when I did a direct link upgrade, it killed Magisk (I couldn't reinstall it), so I downgraded back to November. (I need Magisk - and TWRP had the same problem.) It's only one security patch - and the last one for the 2 - so I'm not overly concerned. (But there's definitely a glitch for those who root.)