From my understanding from various people online and my own experiences as someone who uses an Intel Card in my main rig (used to dealing with wonky drivers although it's a lot better these days) Only use DDU if the situation calls for it. Like swapping GPUs. Otherwise just doing a custom install and making sure you check the box for a 'clean' install is good enough. Similar adage to "If it ain't broke, don't fix it." Unless you're getting a lot of crashes or things just seem off performance/visual wise. DDU is probably overkill in most situations.

I never use DDU, just install over the prior driver. I run 3070, i7 10700k but only at 1080 resolution. In high/ultra settings I tend to sit at 120+ fps. Can’t hurt to try ddu if there are issues

I only use DDU if there is an issue.

You don't need to run DDU every time there's an update. You only really need it if you're having driver issues that can't be fixed any other way or if you're switching GPU to a different brand. And if you decide to run it make sure you do it in safe mode so it can actually remove everything.