Career
Engineers wait too long to escalate, usually for reasons that feel like good manners. The message you've been avoiding for two weeks takes five minutes and unblocks more than anything else you'll do that week.
Merged and released are not the end of a feature. There's a third check most teams never run: could someone demo this cold to a real prospect without apologizing for anything?
If you estimate an enterprise integration by reading the API docs, you've estimated the wrong project. The sandbox, the credentials, the certificates, and the customer's own IT team are most of the calendar.
A demo will occasionally show you the roadmap is in the wrong order. Changing the plan is the easy part. Doing it without the team quietly deciding your roadmaps are fiction is the part that takes work.