I think the Surface Go has a market with LTE.i think it is a great machine for traveling, as a second machine to carry around with you and more. I used to have a Surface 3 with LTE (still have it on the shelf), but recently upgraded to a Surface Pro LTE.
I travel a lot and the 3 was my travel machine. The LTE worked globally and with a Project Fi SIM in it and I had always on data in 170 countries. I could power it from many coach seats on an international flights where I only had USB power. I struggled to get Android working on the 3, but suspect you can with the new Go. With an Android tablet and Windows, it is a perfect travel machine.
My primary usage is Word, Outlook, and browsing. I am a lawyer. My processing needs aren't huge, but I can never completely detach on vacation. In another thread, people are criticizing a guy who had his Surface stolen for locking it in his car trunk. Per those posters, you are never smart locking your computer in your car. Well, that cuts in favor of a small light weight machine when going to foreign places.
As a second machine, I think the Surface Go sounds appealing.