It also means you will frequently be blocked by services such as cloudflare if anyone else you're sharing an IP address with is infected with a spammy virus.
I’ve been behind CGNAT once. It was a miserable experience for this reason. (No idea how many people there were at the one IP address, but https://iknowwhatyoudownload.com/ reported on average ten or twenty hours of video per day being downloaded via BitTorrent from the address, none of which was from my endpoint.)