> Most of the devices also have a custom ROM and are rooted, and using the ACCA app I restrict charging to a maximum of 80% battery capacity.

I used this method too but then LineageOS merged the functionality in a few years ago and it works perfect.

I have a Nokia 6.1 as well but my oldest continuous use device is a Oneplus 8T used to provide hotspot to a location 24/7/365.