Yes, you can omit optional updates if you don't see the need. I look at each one and decide.

I set my Windows update to "Check for Updates but let me decide to Download and Install them". It will work fine now that KB3172605 is installed.

Setting it to "Never Check for Updates" was to make sure that Windows update did not run until KB3172605 was installed.

However, you can leave it that way if you want and just check for them manually.