On the left is Vegas 12 (sharp), right is Vegas 14 (blurry).
Look at the text, and lines. Notice how aliased and blurry everything looks? The text is difficult to focus on.
Now compare DaVinci Resolve 12.5.
I sympathize how Vegas is legacy code, and not designed for modern High DPI scaling.
But I only intended to upgrade Vegas so it would look correctly on my UHD display. When people were saying Vegas was dead, I was almost certain there'd be at least one more release, and it would fix the display scaling problems. I expected it to look better on UHD than Vegas 12 and 13.
In some ways, it does. If you look at the plugin boxes, and the icons, they are more uniform on Vegas 14. The text is not cut off in the media generator, and the icons are the normal size. In Vegas 12, the icons are much smaller than normal, and the plugin section is often cut off where it's unusable.
But the solution for scaling appears to be a dirty hack, which makes the interface look ugly. I don't care much about whether the icons are pretty or not, my concern is that it's difficult to actually see anything, because the text and lines are jagged and blurry. That interferes with the functionality of the interface.
Really the way it looked in Vegas 12 was much better (with "Disable display scaling" checked), it just needed the icons to scale, and the plugin elements not to be cut off.
But DaVinci Resolve is beautiful in comparison. It is sharp, and I prefer a dark interface. If Adobe Premiere CC were the only competition, Vegas would be in a better position, because I'm not interested in paying subscription for desktop software. I've always preferred Vegas because of how intuitive the timeline is, where the video clips behave like audio clips in multitrack editing software. I liked Catalyst Edit for that reason, and it scaled correctly like Resolve, so it was better than Vegas for my UHD PC. But Catalyst went subscription only.
The choice is then Resolve, or Vegas. One I get for free, the other I'd pay $200. Already Vegas is in a difficult spot, because it must really keep up for me to be interested in continuing purchasing it.
When I install the trial, and I see it looks worse than 12 did, what incentive do I have to upgrade? It's a downgrade visually. It looks like the first version of Vegas on my CRT monitor. I have an ultra-high-definition display now, so I cannot pay for software that looks blurry and jagged.
I understand there is a big transition going on, and most of Vegas 14 is probably whatever features Sony had finished when they sold it. I imagine that with time, perhaps things can be improved. Maybe in Vegas 15, or an update, the High DPI scaling can be fixed.
But until that happens, I cannot justify paying for an upgrade.