Gathering Weapon swap coupons is always gated behind doing seasons or waiting for events and they should be always available for players.

If PA would integrate the weapon swap mechanic into the tagging window and make it cost marnis fuel (similar cost as tagging) to transform it would fix the problem of limited weapon swap coupons.

Right now your gear is just locked to one character and you can untag and tag any class to it as you want. Why can we not change the main character as much as we want? This system would also allow us to easily swap multiple offhands like nouver, kutum, eva oh and accuracy offhand.

They never implement something like this. Why? Becouse it made zero money for them. Happy players are not important, its better to just milk them. Majority of players hate enchancing system from release did they changed it in 9 years? Nope. 

Maybe they add weapon swaps coupons in future into shop. 

Thats totally untrue. They even removed most of the swap coupons from the pearlshop.

I feel like the opposite is the case, if people reroll more they need more weight/inv slots/other pearl items. In endgame content people also are dependent on costumes for crons, which should be the main income for them. This just makes more money for them indirectly....