I don't really understand why someone would want a combination device that is a pretty good laptop and a terrible tablet. I'd rather get a great laptop and a great tablet, even if they are separate devices. Honestly, this is part of why I am a little uncomfortable with the laptopification of the iPad Pro.
I think that it depends on how much someone uses a tablet. There are definitely people like you who would want separate devices - one tablet and one laptop. There are people who don't need laptop at all. They can rely only on iPad for their day to day tasks. And there are people that have very specific narrow needs for tablets that they prefer to meet via using combination device.
Take me for example. I don't have a need for regular tablets. I have never had issues consuming media in the bed with my laptop. I don't play games no matter the device. I do a lot of typing and I need hardware keyboard for that. I bought 6th gen iPad because of the pencil. This is the only thing I need. I wanted to be able to take handwritten notes during meeting at works and store them digitally. I also wanted to be able to annotate pdf files. As you can see my tablet usage is very limited and niche. I would prefer to have a laptop that can do this and that has the ports to connect to external monitors and speakers.
Now granted I do play around with ProCreate and do some coloring but that's not actual need of mine. That's more like "I have the device, it can do this so let's take advantage of it".
Due to my nature of work (Team lead of a Software Development team that uses Java as a programming language) no iPad will ever meet my needs. I will always need a computer. As sometimes I need to work from home, it's better to have also laptop. I also need Windows as OS. So now what's happening is that I have a desktop computer at work, I will have a 14 inch laptop and then iPad. Too much devices for me. I prefer to combine the tablet and the laptop experience in one especially considering the fact that I pretty much need only touch screen and pen capabilities.
I think that a lot of people in the work sector might feel similar to what I described. Being able to store your handwritten notes digitally is a huge plus. If you can use the same device for accessing work stuff (via VPN and Remote desktop) and take notes during meetings and workshops it will be even better. Another plus for the laptop in work environment is being able to share the screen. Yes, it's possible with iPads but it's cumbersome. You have to either install specific paid app, use AirDrop and expect people to be in the Apple ecosystem or bring dongles. With laptops I could use their HDMI port. Most workplaces offer HDMI cables and have this setup anyway.
Then there is the fact that quite a lot of people (or let's say enough) use Microsoft Office apps at work. And those apps are just not good in iOS. It's not Apple's fault, but that's the truth. Add to this the fact that a lot of people need multiple monitors and extending displays functionalities. This is supported in laptops, but not in iPads.
Lastly it's also about Ethernet and docking stations. At work we have few networks. WIFI networks do not expose some of the sensitive work stuff. I would never be able to access them from my iPad because of security restrictions. With laptop however I could use docking station and Ethernet access.