[password4321]

All Android apps can be disabled, even if they can't be uninstalled.

[ivanmontillam]

You're right, though I consider that the workaround and not the actual solution.

Also, some apps cannot be disabled depending on the vendor. e.g.: Weather (which launches random notifications from time to time), Radio, etc.

[bandedetrappes]

To use Whatsapp only, without all the other useless features, try using Beeper. Also works to use instagram messaging without having the instagram app itself, therefore no doom-scrolling. It's open-source.