Exactly this. I work in emergency services management - specifically the largest EMS system in the Southern Hemisphere. I am provided with a work windows laptop, but when leaving the office and I am mobile supporting my staff, I use my BYOD 12.9 IPP.
I can access all of the work systems using per app VPN, battery life is amazing, instant-on, wipe clean form factor and the screen quality blows away my crappy windows laptop (and dual 1080p desktop monitors). Office 365 integrates amazingly well, as does Teams (which is hilarious given it's a resource hog on windows). The tablet form factor is much nicer to use in an SUV or back of an ambulance.
I can easily replace the windows laptop for my day job but I would struggle to replace my iPad. Outside of work, my IPP gets more use than my 14" MBP - by a significant amount. But, there are tasks that are just easier on a desktop style setup and for that, I use my MBP with 4k external monitor.
I don't want a single device to rule them all because as we have seen with the surface line, there are just too many compromises....the surface is a mediocre laptop
and a mediocre tablet.
The iPad is the best tablet and the M1 MBP's are the best laptops. Just because something is possible, it doesn't mean we need to do it if it leads to a compromised user experience and here is a prime example:
Touchscreen laptops. Let's be honest, they suck. They are heavier, thicker, have 2-3hrs worse battery life, cost more and generally have worse resolution. Coupled with all the research that shows that they are an ergonomic nightmare
and the vast majority of users never actually use them as a touchscreen, you've got to ask yourself why? Why are there so many people that are vocal about MacBooks not having a touchscreen when every metric shows that they suck?
The answer is, the general population don't look at the research - ergonomics, battery life, function, usage data etc. They just look at what everybody else has and go:
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Thankfully Apple looks at the data and gives people a great user experience despite the above minority of vocal users wanting to compromise the user experience for the majority.