Use an iPad. For the price of a duo you can purchase an iPad Air and an iPhone, even more screens, you can run even more apps next to each other. And the iPad can extend its screen to a normal display if you want to run even more apps.
You are completely ignoring the importance of pocketability and having something with you all the time. My old M1 iPad Pro remains severely underused eating dust because I'm never carrying that thing around with me, including in my work bag.
But once you add the price of cargo pants it's a wash tho.
Yea but, a foldable is way more portable and I'll have it with me always. It will be a nice mobile productivity boost for me.