Suggestions

[Arkfrost]

You're talking about a PC only mod that is 100% client side, is edited on that client and only displays information for that one player using that specific client.

Anything that SE would implement would require game server to client communication

Yeah. And big surprise:
That's literally what is happening already. All those things already do server to client communication. That's how these mods work, because that's literally where they get their data from. I've talked to the devs of those mods and he explained how his plugin knows which fish you have already caught:

which would introduce large amounts of lag that could end up game breaking as the servers would be forced to be individually tracking and communicating that information for thousand of characters per world simultaneously.

As I said, this server client communication is literally already happening and as it seems it doesn't cause any lag whatsoever. The same counts for the crafting log, the gathering log, your obtained orchestrion, your minions and your mounts. All that data is already there, it is always downloaded on login, and all those plugins do is to sniff out the data from UiState to feed their plugin.

Could SE introduce such a feature that is client side only? I don't know. That depends on how PS4/PS5 works and what they allow to be stored/modified client side without server communication.

Some people have this really bad habit of assuming only PC users play this game so if it can be done on a PC is automatically possible for everyone. If it's not going to work on PS4/PS5, they're not going to introduce only for PC to give PC players an advantage.

It is already there, and it is already happening. That's how the code of the Crafting, Gathering and Fishing log already work. Just need to expand that to tooltips. And the PS4/PS5 client isn't that wildly different. It is literally the same code, just compiled for a different platform.

The modding community already has a pretty big understanding of how the game works, how it is coded, etc. The only thing that is shrouded in mystery so far is the server side stuff like boss mechanics, desynthesis info, damage calculations, etc., but almost everything that is client side is pretty well documented and unraveled, and mods use what SE is already offering to piggyback on that.