also so that a crash doesn’t stop everything like a BSOD, also so that you can use the language most appropriate for the task at hand because assuming a single

also so that a crash doesn’t stop everything like a BSOD, also so that you can use the language most appropriate for the task at hand because assuming a single language is good for everything is just wrong, also to be able to incrementally migrate things to new PAAS/build systems/etc in the future so you don’t do big bang... and plenty more multiple library versions is one of the lowest priorities when doing micro services id say this is not to say that people don’t significantly over use micro services, but there are plenty of hard problems they solve