Standardisation
You could get the impression, that only Boeing 737 and AIrbus 320 are equipped with slides...
Plenty of other ships arrive and depart from the dock - all having slides armed in different ways (eh girt bar?)
As soon as no jetty or no stairs are available, these slides have to be armed to be ready for evacuation - not "well into taxy". A couple of times I managed to prevent an MD-80 slide from being inflated by opening from the outside by a jetty operator redocking with a message.
As for standardisation in the future, it sure would be nice - however check out your turn indicator, horn (klaxon) headlight dip switch etc. on your car before deciding that all cars are standardised! There is always someone who's idea is better...