A few unfortunate stories:
High end Dell P3424WEB monitor with integrated webcam. Webcam stopped working (still recognized, but USB device fails to start), newer firmware mentioned something about webcam stability improvements. Firmware update stops at half completion with "Error", only option to try again. Dell solution: replace monitor.
Lenovo N27p monitor with DCI-P3 or sRGB color profile and brightness set to 30%. Monitor defaults to full brightness after power off/sleep while menu does not reflect that and shows brightness at 30. Full brightness is much too bright for use not in full sunlight. When you change brightness in menu to 29 or 31 it drops to correct brightness until restart of the monitor. Other color profiles keep brightness after restart correctly but only DCI-P3 provides correct color saturation. No firmware update available.