Those are usually left over from the initial AWS deployment, so all run B13/B66 with support for BC0/BC1 (although that’s been shut off on most sites). No NR.
Sites with the later Ericsson radios got an OTA update and broadcast B2. On those sites, a B5 OTA update was also available (and tested), but ultimately rolled back. Putting up all that power/spectrum severely degraded the B13 output.
The site atop Crystal Mountain is another story and uses the same setup as the site on the ridge near Neilton. These antennas were selected for their vertical beamwidth.
Most modern directional antennas have small vertical beamwidths and would require extreme downtilt to cover the road next to a steep ridge. Thus, they would have a severely limited coverage footprint beyond the road. Omnis can be a better choice in these instances, especially when there’s LoS to the coverage objective (since they’ll generally have lower gain figures).
Omnis also don’t run in to the horizontal sector edge problem, which can be difficult to optimize for with directional antennas that have complex or irregular 3D gain profiles. That’s why on a lot of sites on mountains, you’ll see wider antennas used. For example, the Verizon site on Joyce Ridge has three sectors with 80-degree HBW antennas.
I noticed today that T-mobile has shut of B41 LTE in the Louisville area and widened the 2nd n41 carrier to 80MHz. That just leaves them with 5x5 B12, 10x10 B2, and two 10x10 B66 carriers on LTE, everything else is in NR (besides their 2G network). They have 20x20 n71, 20x20 n25, 5x5 n25, and 180MHz n41.