The problem is that it's not just learning Perl, it's learning Perl and the monolithic app (or forest of microservices) at the same time; and if that one smart

The problem is that it's not just learning Perl, it's learning Perl and the monolithic app (or forest of microservices) at the same time; and if that one smart dev doesn't want to keep doing it, you keep repeating that learning curve with all the costs associated with it.