1 + 2: Tell them to open a ticket, mark it appropriately, and we’ll do it; but then when you come asking why we didn’t do other things, I’ll show you that chart.
4 + 4b: As a senior engineer, it’s literally your job to interface between leadership, PMs, and junior engineers. “Sync” usually means they want some time to chat about whatever comes to mind — make sure you regularly have these with all major stakeholders. Block out dedicated work hours, but let people consume your time outside of that — it’s your job.
5 + 7: Your job is to manage that we’re paid for features not craftsmanship; hacks are inevitable, but you should leave slack for improvements, document the business case for major fixes, etc.
3 + 8: Along the same lines, help leadership figure out a plan. Unavoidable thrashing happens at times at a startup, but even then, you should talk about roadmaps. Help leadership split the effort between long term goals and immediate payoffs; help them understand priorities.
There are people happier remaining at career IC levels (SDE2 at Amazon) because they don’t want to do these things — and that’s perfectly okay, too.