Again, that's IF you use the app. As I mentioned, I do not use Pages, Numbers, or Keynote. Yes, they appear as upgrades for my machine when I visit the App store, but I do not use them, and thus no need to download the updates. Word 2016 and Excel 2016 work fine as is, and I do upgrade those when newer versions come out (as I do with all of my third party software). Both of my Macs are working fine with OS 10.12.5, without those upgrades from the App store.
And yes, there are times where updates are specifically needed for the OS one is using (along with other reasons/enhancements/fixes, etc.). The same thing is true for third party apps. In fact, in my case, whenever a new Mac OS is scheduled to be released, I will not "move" to that new Mac OS until 6 critical third-party apps I use are either already compatible, or need upgrades. And for the last two Mac OS releases (El Capitan and Sierra), I did not "upgrade/move" to the new OS until after the ".1" version came out, as a couple of my critical third party apps were not yet ready (thus, I initially started with V10.11.1 of El Capitan, and V10.12.1 of Sierra).
Now, if there was a way of removing such unneeded apps from my Macs .....