But do you really need to do these things when you are outside. Obviously not.
While outside, the M1 12.9 iPad Pro is a legit M2 MacBook Air replacement. I can’t think of what the MacBook Air cando that I cannot do on the iPad outside (people are not going to format USB sticks outside).
I’m sure you can think of stuff like music production, coding, but who the hell is seriously doing this outside and why?
I mentioned those since the poster seems to want to go iPad-only.
As for what you need when you are outside, that really depends. Daily commute, I just carry either iPad Air or mini (no physical keyboard). If I’m traveling for work, then I can’t go iPad-only and yes, I may need to format external storage.
Also, when we visit family overseas, we usually give away our older iPhones and iPads so I carry a laptop to do a final backup of the iPhones/iPads we’re giving away.
Mind, I once connected my Kindle to my iPad Pro to copy some DRM-free ebooks and iPadOS nearly corrupted my Kindle (froze then went into boot loop but thankfully recovered after disconnecting from the iPad). Indeed, I’ve had to fix the MBR and format a 1TB USB flash drive (exFAT) after it got corrupted by iPadOS. Thankfully, I have backups so no data was lost.
I love iPads. I use them like 90% of the time and I pretty much have all the sizes: small - mini 6, medium - Air 4 & M1 Pro 11, large - M1 Pro 12.9. That said, I’m not blind to iPadOS’s limitations.