Yup, to each their own--I know you love your SP4 and it works great for you. I find I spend more time on my iPP 12.9 than anything else. love navigating by touch and find I can fly around the OS and get just about anything except the most intensive tasks done quickly. My daily workflow just seems to fit it well. And you don't think about it until it's missing but having a fingerprint reader to quickly unlock the tablet as well as for apps and especially my password manager is immeasurably useful.
Conversely, trying to navigate by touch is less efficient on WP10 and using the Samsung's keyboard/touchpad, while pretty good for a lightweight, detachable, still can't compare to a fully functional laptop equivalent so, I'd rather just use that when it's needed.
When I find myself always reaching for my Mac or my iPad without hesitation, and would rather carry them both if needed, it immediately tells me a Windows tablet/hybrid isn't for me. My son will probably love it though and do things with it I can't even imagine--not so engrained in one ecosystem yet like his old man.