The biggest implementation error that I see falls into the following with any solution:
One of the biggest issues that I've come across is security operations (or anyone managing Cortex XDR) is that they just enable everything without proper testing. Ideally you get at least one person in each area of the company to get things started and see how XDR impacts them. You might need to make exceptions and tune things depending on the demands of the task the employee is doing.
When people bypass this step and just roll-out XDR across the environment without the proper amount of testing, you'll generally see organizations demanding that XDR be set to just generate alerts or overly broad exceptions be made. I've found it better to slow walk things and end up more secure at the finish line than start off running and breaking things to the point where you end up with a less secure "working" configuration.
That follows up with point number two. When you are forced to make exclusions make sure that they're as limited as possible. The number of developers that want exclusions for their entire repository as soon as they run into any issues is going to be high; you'll need to actually look at risk versus benefit when making any exclusion and always argue to make it as small as possible while still allowing folks to do their jobs.
Lastly, the number of people who deploy things in a "detection" only format to get off the ground and then never go back and make things actionable is extremely high. The number of responses I've been a part of where their security solution identified steps in the attack chain but wasn't configured to actually prevent/stop the attack is way too high. You'll always hear the same excuses on why things never moved forward, but if you're only generating alerts and something comes in at 0200 in the morning you're compromised by 0215. When you stroll in at 0800 and see all of the alerts about malicious activity you're hours too late to do anything.
If you move forward with any sort of "detection only" deployment to start things off, you need to make sure that you can move into a prevention standpoint quickly. Sometimes people just never moved things to a prevention status, other times they just missed a profile. Make sure that you're actually reviewing your configuration on a regular basis and that your configuration will actually prevent malicious activity.
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