Speaking for myself, yes, the size and feel of the S3 is better than the SP4 (as a pure tablet only). Anyways, who knows what MS is doing!!!Is it though? A lot of times I feel like I'm using a bit too small of a device. I have used the Pro 4 in the lap and feel it's better than the smaller Surface 3. Also, I don't think I will mind it being a larger device if it's thinner....later next month I will go to my local Microsoft Store and check out the new Surface Pro and see what my thoughts are after checking it out.
Still feel that the extra ram and bigger screen will just improve the experience that much more....
Edit: When you do get the time to check the SP 2017 in person, do please update. In particular, I would be very interested to know how it felt when used and a pure tablet in generally mobile conditions. Thanks in advance!!