If you get your site with your text number and have done the early check-in, there is no requirement to stop at the front lobby building. Once you get the text, your Magic Bands will open the automatic arm gates at the front and back for "returning guests" (the front gate has a parallel gate manned by a security guard who will admit you if you haven't gotten the text yet and see if you are on the list for that day's arrivals).
We have driven in and gone straight to our site.
The only reason to visit the lobby is to get the check-in packet of information (Fort map, movie/recreation calendar, park time guides for that week, the glossy brochures, etc.). If you don't want that stuff, no need to stop at all. I've come back later in the day or next morning and gotten it before though.
Bama Ed