I think the confusion is because "something new" isn't necessarily a completely new, disconnected product. It could be something like adding multi-lingual support to an existing product. In that case, you often do need to coordinate across many teams to get the new feature implemented, which can be a huge pain in a micro-service architecture.
No more than it is a pain in a service architecture – being the exactly same thing, just in a different economy. As always, if a service doesn't do what you need, you build your own in-house. Just because there is a product on the market is that is kind of, sort of, but not really, what you need doesn't mean you must use it.