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It has other advantages.

Operationally, it is very nice to be able to update one discrete function on its own in a patch cycle. You can try to persuade yourself you will pull it off with a modular monolith but the physical isolation of separate services provides guarantees that no amount of testing / review / good intentions can.

However, it's equally an argument for SOA as it is for microservices.

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There are some other benefits like having different release cycles for core infrastructure that must never go down vs a service that greatly benefits from a fast pace of iteration.

Literally one function per service though is certainly overkill though unless you're pretty small and trying to avoid managing any servers for your application.

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