If you want an answer, I can give you an estimate.

The reason why the token system exists as items comes largely down to how character data (i.e. everything tied to you) is handled. With exceptions such as Beast Tribe currencies since there is a finite number of Beast Tribes per expansion, rolling basically every Totem and Raid token into a currency tab now means the server handling character data (which already is storing a lot of data for each individual character) will have exponentially more currencies to keep track of, meaning more storage is needed.

Now extrapolate this to every single player playing the game requiring this data being tracked for being in a currency tab and you potentially have a ton of more character data stored, even if it is empty - assuming it is coded this way, which I'd absolutely believe since the engine is actually a bit old. Either way, yes you could absolutely just expand data capacity by getting bigger / better / more hardware, but not right now and definitely not for free. You buying retainers should know this better than most, that additional storage of anything isn't free and can't be made out of thin air.

To your loss of the tomestones - nothing you can do, tough it out with HQ Crafted weapons if you don't have the P4S weapon yet. Bad inventory management is entirely on you and noone else.