Pro Apps need more RAM. The iPad has only 6GB of RAM, which is perfect for a tablet, but very low for a productivity workstation.
The iPad handles RAM completely differently than a Mac and has for years. 6GB is not massive but is definitely enough given that I can do high res image editing and artwork in affinity photo painlessly while also using slide over or switching apps a couple times. And that’s on my 2018 pro with 4GB.
Also with the rumor of an ultra high end iPad Pro Max (or whatever it’ll be called) coming later this year along with rumored pro apps they might beef that up to 8GB.