M2 and M1 - external monitor flickering

I am at my wit's end. I have a Dell u4021qw. Scratch that. I am on my 4th Dell u4021qw. Yes, four times, Dell has sent replacement units. My personal laptop is a Macbook Air running 13.3.1 and my work laptop is Macbook Pro also running 13.3.1. Personal has an M1; work has an M2.

I have changed cables, switched ports, and turned everything off and off. I've let the monitor sit unplugged for hours on end. Changed all the settings ad nauseam. None of the setting changes had any effect. Had it out with Dell, who once claimed in writing that the monitor is not compatible with Macs. They retracted this in a different email. Spoken with Apple, who blames the monitor, but of course, demurs when I mention just how many others with different monitors are b1tching about this very thing in various forums. One rep suggested I spilled something on my laptop. My babes, that would mean I spilled something on three different laptops, no?

I am ready to chuck this monitor out the window. I can't work on it when it's flickering. I get flickering in various speeds and sometimes, there are stripes, too!

There is no discernible pattern to the madness.

Infuriated, uporoductive, and now out $2k for a monitor I cannot use.

When is Apple going to resolve the M chip issues with ultrawide monitors?