In Guardians of the Galaxy Vol. 2, a group of Watchers are shown listening to The Watcher Informant(Stan Lee). But in What If...? Uatu(The Watcher) is shown watching over the multiverse alone without help. This has a few implications (namely, Uatu has some informants, or it's a plot hole) but my favorite is that the group of watchers are just lazy compared to Uatu because they have an informant instead of watching themselves. This could be because they are afraid of getting attached to the universes (like Uatu did) but them being a group(therefore splitting up the work) and the fact that they have only been shown watching over the prime MCU lends credibility to the idea of them being lazy.