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I actually don't hate the idea of making Expert accessories able to mix and match. A lot of them just don't have the importance to overrule the choice of other, more necessary items, and the power of spores and healing would be much more appealing.
Well, technically, we already have Expert drops that are able to be combined, but those don't even make an accessory. Who knows, maybe those minecart pieces should have a better use? Maybe they could be combined with some accessories from the bosses the mechs are based on?