Tamron 15-30mm, Nikon 14-24mm, Sigma 14-24mm and Tokina 16-28mm are all rather big, heavy lenses.... all are over 2 lb. Other than the Tokina, close to 2.5 lb., in fact.
Another thing... all four of them have protruding, strongly convex front elements. They can't be fitted with standard filters. In some cases, there are specialized filter holder that clamp onto the front barrel of the lens, to hold square and rectangular 100mm or larger filters. Those are a pain in the arse to pack and carry around. Plus they're expensive. And virtually impossible to shade very effectively, when that's needed. The lenses themselves have relatively shallow built in tulip shaped hoods. But the clamp on filter holders and filters make those ineffective. Also, special lens caps are usually required by these lenses. If you lose one, you'll probably have to special order a replacement, if it's even available a few years from now. An alternative is a Hood Hat, a stretchy neoprene lens cover from the folks who make Lens Coats, etc.
Do you reaallllyy need f/2.8? Most daytime landscape shots are done stopped down at least to a middle aperture. If you were planning to do astrophotography, maybe f/2.8 would be helpful when trying to set up your shot in the dark. Sports photographers, folks shooting architectural interiors and photojournalists might want and need f/2.8 (or even faster). But do you really need it? You only mention shooting landscapes.
The reason I ask is the Nikkor AF-S 16-35mm f/4G ED VR Lens... Yes, it's "only" f/4. But this allows it to be smaller, lighter (1.5 lb.) and nicer to carry if you'll be hiking any distance. It's also less expensive... just under $1000, where the f/2.8 lenses start at $1200 and go up from there. Plus, you can use standard 77mm filters with it. I don't shoot with Nikon, so don't have hands-on experience with this or the other lenses on a high resolution D850... but I wouldn't be at all surprised if the f/4 lens was sharper and better corrected, too. Often premium f/4 lenses are sharper corner to corner. f/2.8 lenses sometimes get a bit soft in the corners, although they usually improve when stopped down.... But then you paid for a bigger aperture and carried around a heavier lens, just to end up stopping it down anyway.
Two millimeters... 14mm versus 16mm... is very significant at the wide end of things. It would be imperceptible in a telephoto lens, but is noticeable in an ultrawide. Still, 16mm is pretty darned wide!
They aren't as versatile as a zoom... but someone mentioned a Nikkor 20mm prime as a smaller, lighter, less expensive option. I agree (and carry a 20mm lens a lot). There are also some pretty impressive 14mm and 15mm primes.
Yes, I often use a Circular Polarizer on wide lenses. For both the images below I used a B+W Kaesemann C-Pol. In the first, the sun was above and behind me so the filter's effect is fairly even across the entire scene. I actually "dialed it back" a little, to retain the reflection of the boats in the water. The filter deepened the blue of the sky and the green of the water, while making the white of the fishing boats really "pop". For the shot of the lighthouse, the sun was low and off to the left, so the filter's effect in the sky is uneven. I decided to use the effect, rather than try to avoid it (which would have been impossible anyway).
Here's another shot of the same lighthouse from a different angle on a different day, made with the same lens and C-Pol , where I also don't feel the uneven effect does any harm to the image (sun off to the right and low on the horizon)...
Here are two more lighthouse photos... older shots that were done with film cameras, the wide end of a 17-35mm lens and B+W Kaesemann C-Pol filter
So, yeah, I often use C-Pol... even on wide angle lenses. And not just for shots of lighthouses, either
Besides, it's not just C-Pol filters... some landscape photographers also like to use Neutral Density filters in various strengths, to be able to do longer exposures that cause water to blur.
For that reason, I'm not a fan of lenses with convex front elements that make filters difficult or impossible. (I really appreciate the cool, drop-in filter lens adapter that Canon came up with for their RF system, which is now also being offered by Breakthrough Photography... filters behind the lens, instead of in front of it! This solves the filter problem with this type of lens. So maybe I'll get that 17mm Tilt-Shift lens in the future, after all.)