Every once in a while at least. As in your tax return or something.
But even when the iPad can do a task (as, let's say, "finishing your term paper"), the question is:
Can it do these tasks as good as - or better than - a Mac?
I find that the iPad can do a lot of things that a Mac can however, they usually require workarounds which makes the whole experience more clunky and less intuitive.
At this point in time if your an artist/designer yes the iPad is an awesome device, if not, the iPad is merely an extension of your Mac and/or a content consumption device.
For example my use case at the moment for the iPad is content consumption/social media/few games now and again and using it to read through my uni work and take notes etc… but once I need to get some real tasks done like writing essays, editing music/video, editing websites etc that’s when I utilise the mac. I have a lot of apple devices including HomePods, apple TV’s, Watch, iPhone, mac and iPad and if I had to ditch one product out of them all it would probably be the iPad mainly because my use cases for it I can simply do with my phone albeit on a smaller display.