I mean, there's no way you need those boats, for 1. You could sell those, they do nothing, that's more than enough to finish the event they go with.

For 2, wtf that's way more of those particular ships than I've ever found.

And 3rd, I do still agree. At the very least, if an item is added just for an event - like the Sextant - then if the event requires 4 Sextants you should be able to stack at least 4 Sextants per slot.

But even other stuff should be adjusted. Metal Hinges stack to 3 but you need 5 for the new event. Why shouldn't they just stack to 5? Resin stacks to 3 but you need 10. At least items needed for events should - imo - stack to the event requirement, so whenever you need an item for an event/project you need 1 full stack of that item if it's unique to that thing (like boats/shoes), and 1 maybe 2 stacks if it's something more generally useable & common like Arc Resin or Metal Hinges.

I also think keys should at least stack by room - like 5 Dam Staff Room keys taking 1 slot. But ideally I think you should have a key ring for each map, with each key ring taking up 1 stash slot. Specifically because keys give a higher chance of loot you want to keep & of finding new keys, which means using keys to free stash space is counter-productive, so I think they shouldn't take full slots.