As a new player I strongly oppose the 15/15 weapons upgrade, its a terrible idea that will negatively affect everyone in the server as someone who watches the player market on a daily basic.
Here is a list of various negative cons this change will make not only affect players but will also negatively affect the current fragile market due to very low server population:
Celestella Token Weapons that are rewarded only once
"PER ACCOUNT" when reaching level 200, you get then once and you will never get another one till you make a new account, once weapon is broken is permanent you can't sell your broken weapons to anyone or get a new one.
Customized weapons are account bound you can not sell your broken "junk" I mean broken weapons you going to have to get a new one and you will need to rebuy materials that other new/casual players will need to make theirs if you have big pocket this is no problem but you will screw over newer players/casual gamers over since players with big pocket going to buy the materials to make those weapons and raising prices and making the scarcity problem even worse.
Rare /U not dropped in events that are very rare, very high scarcity on the market and expensive. Players who already own these weapons will start buying them over making the scarcity even worse and raising the prices and players like me will have to settle with buying "broken weapons" while paying premium and probably more than before. Again new players and Casual players will get screwed over. I experienced this when the last event ended where players will "Big pockets" started buying all stock in the market to resell for 4x times the price.
I have had players including players that have played this game for a long time refuse to buy weapons from me since the weapons were not 10/10. Since they rather pay 5-10 million more to avoid the upgrade gamble to +10 since upgrading is the most tedious and annoying part of this game and this upgrade will make it even worse while screwing the player market at the same time.
Some classes use multiple weapons my acromaster uses 5 types of weapons(slicers, twin daggers, twin sabers, saber, dagger and wands) and in this game you need 6 elements per weapons that means 30 weapons I will have to go through the trouble to +15 making the game more tedious than it is and just increasing my desire to just stop playing the game.
This is even worse for players that have multiple alts and like to keep the variety by switching to other Types, for them they will have to go through the tedious task of upgrading and breaking 1000 of weapons to get 100+ of weapons to +15.
One of the reason why I have not level up an alt or try other type is because I am still gearing up my main type class and for now not ready to +10, 10-20+ weapons again for another type and this +15 will push me even farther away to try this and will just force me to limit myself to a few weapons and types as possible.
SPECIAL WEAPONS and other very rare weapons that are very hard to get, imagine getting a DB SABER☆ with element 60% and the weapons breaks and you end up with a 12/15 broken weapons, in my case I would say screw it and quit the game. So this is going to screw hardcore players as well. You must be some sort of masochist if you going to try to get other DB SABER☆ with 60% element to make it 15/15.
If you want to still implement 15/15 to please a very small minority of hardcore players without screwing the market for new players and casual gamers then just make event only weapon type that can go to 15+ just as those past weapon in last year event.
https://psu-clementine.net/wiki/index.php/Yohmei_Wand that could go +5.
But don't screw the market of the rest of /U weapons for us Casual and newer players.
We rather have good weapons like everyone else instead of having to pay premium for broken weapons and we would also have a smoother experience if we would like to try another type or alts as well by making the most tedious part of the game grinding even worse than it is, with a low population that has a market with high scarcity.