I have a 14" MBP, an iPad mini 6 cellular, and a 12.9" iPad Pro M1 wifi (graciously provided by my workplace).
I select the right tool for the right job.
And as far as I'm concerned, the iPad is a computer. I don't code, so the argument that there's no terminal or command line access is out the window (no pun intended). But, if I can edit a PowerPoint deck on it, access remote work applications via Citrix, upload/download/forward files, write notes during a meeting, open/edit/create Word and Pages documents, and even do all the above while split-screening a web browser window and float a video window on top of it all, it's a computer. And while I never use it on the built-in screen, Stage Manager is really something when my iPad Pro is connected to an external display.
And it's not uncommon at all that I'll use two at the same time. I find it faster to take handwritten notes in a meeting on my iPad mini while having other documents open on my laptop. I haven't used a pen and paper in years (and, subsequently, tend to lose things a whole lot less).