It's not really about what's better, it's about whats been standardized upon.
I'm sure I could gain many of the advantages of microservices through an OSGi monolith, however, an OSGi monolith is not the hot thing of the day, I'm likely to be poorly supported if I go down this route.
Ideally I also want some of my developers to be able to write their server on the node ecosystem - if they so choose, and don't want updating the language my modules run on (in this case the JVM) to be the biggest pain of the century.
Besides, once my MAU is in the hundreds of thousands, I probably want to scale the different parts of my system independently anyway - so different concerns come in to play.
I'm sure I could gain many of the advantages of microservices through an OSGi monolith, however, an OSGi monolith is not the hot thing of the day, I'm likely to be poorly supported if I go down this route.
Ideally I also want some of my developers to be able to write their server on the node ecosystem - if they so choose, and don't want updating the language my modules run on (in this case the JVM) to be the biggest pain of the century.
Besides, once my MAU is in the hundreds of thousands, I probably want to scale the different parts of my system independently anyway - so different concerns come in to play.