@lucky1m some of the spawns suck, you dont have to take the fight though you could just fully turn out and choose to engage in a different area. There's only one spawn I can think of where you are ridiculously close to a rock. Ones like the devil's roar spawn you could just sail past slightly before doing the usual turn and raise etc, volcanoes are more an issue for me here although I would happily remove that from the spawn pool.
Bonecallers I disagree, people taking the time to get resources shouldn't be punished, its not that often that it is the biggest factor, and even then it'll likely only be one win they get using it. Curse balls are the same, they dont feel great but they have to be used appropriately or can still be countered. For bonecaller (assuming your mast isn't down and on sloop) try standing on your canopy behind anchor and just use blunderbombs to knock them off ladder before you deal with the skellies. You mention only found by luck, shipwrecks have decent spawn rates, burning blade has them everytime (at least 8 i dont recall exactly number)
To clarify I wouldn't mind everyone having same supplies like arena of old, but whilst that isn't the case then specific items shouldn't be restricted.