In any case it is very very necessary to consider the nature of any and all circuitry and devices that you have attached to the "bus" when doing I/O in a turn-around manner like this. Always make sure that you prevent cases where the MCU is in push-pull output mode at the same time that some other device is in its own output mode on the same wire(s).
A design - not mine (originally) - worked beautifully for a very long time and then chips failed. I found (VERY well hidden) that for brief periods of time, a signal was pulled up and down (but not read while the 'dual pull' existed).

I am 'scared' of some such condition being missed when 'someone' some day in the future makes a change and 'accidentially' makes this happen.

My experience is that you can definitely avoid this in your original design, but the person that, after you have left, get tasked with a "nominal change" to a product he does not know, may create this.

I think that one of the duties when creating the original design is to think of the poor sod that - without any knowledge of the product - get tasked with doing something 10 years down the road.

YES, of course you document it, but will the guy that has 2 days to make a change to something he does not know (yes, I have been 'that guy') know enought not to have the potential?

Erik

PS: now someone will post "he should read and understand the documentation" which he would in an ideal world