I used to love Custom ROM during GalaxyNexus days (about dozen years back), today is totally different. Earlier I had lot of reasons to root the phone, most of which are solved today. Restrictions from UPI, mAdhaar, Banking and other apps also won't help.
But this link will be helpful for many friends here. Even though 5G coverage of Pixel 6a is WORST, its 4G coverage is good enough. So for VoId or BSNL user, this is a great phone.