Leadership definitely drives a lot, but even with bad leadership a PM can and should do a lot to help here. I spent 5 of my years of PMing with an operations org that drove every big decision and I still did everything I could to protect my devs. I ended up in major burn out from it multiple times, but I don’t regret it.

Alerts that are waking devs up in the middle of the night have a user impact too, and a PM can and should communicate that impact and risk to the business side as part of why it needs to be prioritized. Alternatively, there might be a reason that the UI change is ultimately more valuable, and it’s the PM’s job to communicate why that is the priority to their devs. If developers with a Product team ever truly believe the reason they’re building something is just “because [insert team here] is excited about it,” then the PM failed at a critical responsibility.