I get that there a lot of people who buy this because they NEED it for business applications, but like it or not this thing is compared to an iPad. If they have no desire to convert iPad users to Surface Pro users (and maybe they don't, I don't know,) then that's fine. But if they do, it still needs a lot of work as a tablet. It's a laptop with an optional keyboard.
I don't mean to nitpick, but how can a laptop - by definition - have an optional keyboard? That is virtually a contradiction in terms, isn't it? But I do get the general thrust of what you are trying to convey and, in part, I am empathetic to your argument.
Of course, while it would be nice if MS did bundle the Type Cover with the device as they do the Pen, but I don't think that is going to happen anytime soon except maybe for specific promotions.
When product comparisons are concerned. notice one thing, the comparison (and effort to emulate) is driven by Apple (thus their Pro line of iPads). MS has never really argued for a comparison with the iPad. If I remember correctly, Panos repeatedly argued for a comparison (of the SP3/4) with a MBA. That said, many have argued - and I include myself in this group - that W8.1 was probably best suited for the tablet interface, which was changed over by MS in W10. Certainly, it made W10 less of a tablet-friendly OS. But the thing to keep in mind is MS is trying to walk a rather tight rope here. While they don't want to alienate their core users (the desktop users who most vocally voiced their problems with the W8.1 interface), they also don't want to develop and maintain two OSs (like Apple does).
Yes, the Surface (SP4) is a tablet and yes, its ecosystem is rather limited as a tablet when compared to the iPad, but the Surface is a lot more than just a tablet and a laptop. It is a very curious device which sits between the tablet and the laptop and the onus - as you have correctly pointed out - lies on MS to make our experience of the tablet and the laptop come together on the Surface platform by leveraging W10 and how it allows for the tablet and laptop experience to segue into each other.