I disagree.
First, there are far worse ways to spend coins (like, for cash). And while it's true that the presents box is unlimited in space, it is limited in time. If you don't take the stuff out it disappears after 30 days. That's quite long, so it won't be a problem usually, but it still means that you can't think of the presents box as unlimited storage. Also, you can't fuse, evolve or use cards in there.
The storage increase is a long time investment.
You'll want at least 10 free slots in your card inventory for fusing purposes (unless you enjoy fusing them one by one or something). That would leave you with 90 base slots. I have already filled almost 60 of them (6 UR, 17 SR and 34 R cards).
"Not everyone is a collector/completionist like yourself Unregistered" you could say. "Fuse the R cards and make some space". And you'd be right, I probably will need to sometime in the future, but that won't solve the problem. We get 3-4 new UR/SR cards each week with events and the SR added to gacha pool (normal players probably won't get the UR added to gacha anytime soon). That's 12+ a month. In 5-6 months we will fill our base capacity with SR/UR, and then what? Get rid of SR? But even if you're not a collector, that would probably reduce the number of tactics available to you. You'll probably need to do it anyway once they become too many, and there will probably be some totally useless ones, but with more storage you won't need to for longer.
- - - Updated - - -
Did they took out raid bosses? haven't encountered one all day.
- - - Updated - - -
Unlike DT:M they appear only during events in this game.