Good point.
What’s ironic is with the prevalence of cell phones, how much attention still has to be paid to legacy technology. For example, I administer five company sites that are tied into a single IP-PBX. The most concurrent calls (other than a reporting anomaly) we’ve had across all of them is twelve calls looking back over the past 2-3 years. Back in the days of a PRI into our main office alone, we’d often exhaust 23 channels during the busier times of the retail season.
Still having to support elevator emergency phones auto-dialing 911, support independent copper POTS alarm lines for the security alarm panels for U.L. insurance requirements, support copper POTS faxing for international vendors where analog FXS and T.38 don’t cut it, etc. is a throwback. And this is coming from someone who cut their teeth on Merlin Legends, Nortel Meredians, and Rockwell Spectrums. 
I realize that cell phones and 911 aren’t always a winning situation. But in the year 2020, if I were having an emergency and was physically able to communicate to someone, I don’t know why I wouldn’t just grab the phone in my back pocket. But the law is the law and the FCC are the FCC.