> I don't want to support their homegrown HTML templating library in production
On the flip side, that's how projects like Spring, Spark, jQuery, Angular, React, Kafka, Cassandra and Mongo came to be: somebody did something that somebody else was always doing, but a little bit better, and ended up making a career out of it.
Sure! And I think the degree to which you have the "room" to do that in your job depends on the company. I'm not here to spend my novelty budget on a routing framework that can't handle optional parameters.
On the flip side, that's how projects like Spring, Spark, jQuery, Angular, React, Kafka, Cassandra and Mongo came to be: somebody did something that somebody else was always doing, but a little bit better, and ended up making a career out of it.