I have a hard time buying this hybrid architecture is the future. Running a bunch of stateful services with potentially large storage requirements in my own infrastructure is not zero-maintenance even if the control plain is managed. And proxying the UI for end users introduces back security and usability issues.

The best experience and lowest friction sale is to deliver a fully managed experience and earn the trust of customers. Confluent, Snowflake, Mongo Atlas, Rockset, CockroachDB, Elastic, Splunk, New Relic, etc all prove this is a great model for both customers and vendors. For the largest security conscious customers you can offer a fully VPC/on-prem solution with exactly the same form factor if you want. Hybrid can have its place, but I'd always try hard to offer a managed solution if you can justify it.