After having used tablet first 2in1s since MS released the SP4, I am fairly certain I’ll never go back to traditional clamshell laptops.
I personally find that detachables offer far more flexibility than a laptop will ever be able to in that they are able to accommodate far more positions, either while seated, standing up or laying down.
For example, as I am writing this, I sit in a chair, with my feet on another chair and my knees pointing up. The kickstand rests flat on top of my knees and the keyboard is comfortably in my lap. If I were using a laptop, all the weight would be in my lap and sliding downwards, or I would have it balanced on my knees, making it hard to type.
As for plain lapability, I have never had any troubles, and find that with the smaller size (compared to say a 15.6 inch laptop) of the V or SP4 still makes it take up less space and sits more comfortably on my lap than the laptops I used to use.
Granted, I haven’t used any laptops newer than from around 2014, nor smaller than 15.6 inch for any prolonged time, so I can’t compare to the lapability of more recent laptops, but I still prefer the flexibility of a detachable.