I agree with you that single use is stupid. I don't recall anyone advocating for that, on either side.
Since you keep bringing up public lands in TX. Yes, you have 2M acres, give or take, and that doesn't include the coastline or flats. Coincidentally, that's almost the exact same acreage (2M) as my home state of Virginia. For comparative purposes, that means that TX has roughly 1.1% of its total area in public lands, whereas Virginia has approximately 7.3% of the total area in public lands. TX may have the same amount of land open to the public, but that's a greater than 600% difference in access potential (given the overall size of the state in comparison to public lands) . When you look at acreage per population, the contrast is just as stark. 27M people in TX, with 2M acres (0.074 acres per person) as compared to 8M people with 2M acres (0.25 acres per person). On coastline, based upon NOAA measurements, TX has 3,359 miles of coastline (7th among the states). VA ranks 8th, with 3,315 miles of coastline.
As someone that hunts, fishes, hikes, and camps public lands in Virginia (and many other states) quite frequently, I think the comparisons between the two states as far as public lands, shoreline, access, and use are rather accurate. I can also tell you that, at times and locations, those public areas in VA can get crowded. I'd not want to consider what they'd look like with 3.5x as many people to access the same amount of public land and shoreline, nor would I want to consider having to potentially drive up to 6x as far to get to them.
Just food for thought, and for comparative purposes only.
BTW - I even like TX. Some of my ancestors from SW VA were there when TX was "born". It's a good state, but as for public lands usage and as an example, it doesn't really make a lot of sense in many respects.