The successful micro-service architectures I've seen have a remarkable level of uniformity. Many such environments have standards down to the level of use this particular http lib +internal wrapper.
At the end of the day there are not large enough differences between say ruby and python to justify different teams choosing ruby or python at the same (medium-sized) company. If you have this level of difference, you've effectively permanently engrained conway's law into your organization.
Isn't this literally one of the more common arguments for microservice architecture?
It empowers teams to choose the right tool for the job, i.e. run their own tech stack.