Thanks @bobc for your voluntary efforts on this library. Looks good.
These “revolutionary changes”, as you put it, don’t seem to change much at all other than eliminate the troublesome implicit connections. I don’t think there is any reason to wait, if the new library format allows additional features to be implemented then it can be revisited
if and when that ever happens.
Use an arc in place of the “bar”, 3 sizes of arc/bar for 2,3 and 4 inputs, but keep the symbol body the same size. Beyond 4 inputs, I’ve often seen multiple arcs used or one arc extended with straight lines as @davidsrsb suggested.
I do think it is rather ironic that the main reason for a separate power unit is to lessen “clutter” on the schematic and yet the power unit itself it so much larger than other units.