To fast charge or not: OnePlus could be working on a cool solution

I'm curious how long does your phone battery last these days?

It used to be that my early smartphones from years back would barely last a day and I'd be looking for a charger all the time. With my latest phone, on a reasonably heavy use day, I can go to bed with about 50 to 55% battery left. And last night, I barely used my phone at all and went to bed with like 65 to 70% battery left. And to be clear, it wasn't sitting on a charger all day either. I got up, went to work and at the end of the night was left either enough battery to last be the entire weekend if I had continued the low usage.

Battery tech, and CPU and screen efficiency has advanced enough to where getting 2 days is not uncommon and I don't care if it takes a couple of hours to recharge it at night. I also think much of the initial excitement of having a smartphone has died down so I'm not on it 24/7. Also having a tablet to offload some usage time helps as well.

So ultimately super fast chargers seem almost useless to me for most situations if they degrade the battery at all.

Alright, this is slightly related to the topic at hand:

I think the charging up to 80% is kinda bullshit. I've been using my Redmi Note 10 for 2 years, and during that time I've used the 33W charger and almost always waited until the device was under 10% and charged it to 100%.

I've used AccuBattery and it guessed the battery health was at 85%. This is still more battery left than what I would have if I kept the device between 20~80% charge. So I don't get it