This. I mean, modern game companies could setup a common (for every game) Headscale or similar solution, let group of friends create their own private VPN between them punching through any NAT and host their own distributed multiplayer game. Yes there is still some involvement server aide from the company but it could be easily shared between games. And if support ends, you still leave players with the option to use their own LAN/VPN system.
Timing issues can be worked around and GPS modules are cheap.
NAT problems aren't usually that bad. Only a minority of networks use symmetric NAT implementations, with most seeming to be using port-restricted cone NAT (EIM/APDF), which can still communicate with any other NAT implementation using endpoint-independent mapping (EIM). Most CGNAT implementations that I've encountered use EIM, with some also doing endpoint-independent filtering (EIF). Between UDP hole-punching, UPnP, NAT-PMP, and IPv6, it's usually possible to establish a P2P connection between 2 endpoints.
A game could use a hybrid client/server and P2P model, with the option to run entirely P2P while accepting its limitations.
Designing a game to use developer hosted servers is a choice they made. Probably to squeeze money from microtransactions.