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@pastry_lover
Why would the chainring pinch bolt unscrew? Mine has stayed tight for 10 years. Some BMX cranks don't even have pinch bolts nowadays, they just have a stud that sticks out where the pinch bolt would normally be (a bit like on one-piece cranks).
You should actually be able to align your chainring with your rear sprocket more easily than with square taper cranks on a euro BB, just by adding spacers between the chainring and the bb.
You've already mentioned weight... so I won't go into that....
A Mid BB should last longer than a Euro because the bearings are bigger, thus stronger. Providing that they're decent quality in the first place.