It's always hard to balance delivering fast vs delivering quality software. I've been involved into multiple similar reviews were I'm coming as an outsider and assess existing platforms. Both what people will typically call "legacy" but also "modern" (read microservices) ones. Without a clear governance and consistency any of the approaches will end up with similar issues: performance, scalability, hard to extend/maintain, excessive use of tooling (there was one platform that kept all logs in a log aggregating tool, but didn't have any way to get the raw data). You can be fast and consistent/have a clear vision. No need to get it to production "no matter what".