Late in 2024, 2K removed its launcher and everybody cheered. This was not just another bit of obnoxious corporate bloatware, but one that prevented Linux users from playing BioShock and affected Midnight Suns' performance.
Unfortunately, it's not all been good news. Look on the Steam forum for XCOM 2 and you'll see threads noting that some mods no longer work, and having them installed can result in consistent crashing.
Similar complaints have appeared on Reddit. Using the Alternative Mod Launcher, a community project that helped players get around the 2K launcher, doesn't help either.
Testing it myself, I found that XCOM 2 would only launch with certain mods enabled, and fail no matter which launcher I tried—both the old and new options provided by Steam and the Alternative Mod Launcher.
The unifying factor seemed to be that mods with the Wrath of the Chosen expansion as a hard requirement worked, while those without it did not.