It wasn't actually changed in 1.4 or beyond, but I'd like to bring up the reindeer mount. It's my favorite mount for aesthetics, but functionally it's... lacking, considering it's apparently intended to be on the same level as the UFO.
My first issue is just with getting it in the first place. It's a less than one percent drop... from the strongest boss in the Frost Moon... and only after you get to the fifteenth wave... and the drop rate still never reaches one percent if you make it further than that! The UFO, by comparison, has a 16% drop rate from the Saucer, no matter how far you are in the invasion.
Second issue: it handles like a truck with three flat tires. Given that the reindeer's intended niche appears to be high-speed flight, this is a big problem because it makes it very hard to avoid things, and wastes a lot of time getting back up to speed when you crash into something, which is inevitable because the reindeer has limited flight time (limited even harder when you don't start from top speed) and must return to obstacle-laden earth eventually. It's usually faster and less involved to just fly across the world with whatever wings you have at that point.
I'd suggest a substantial drop rate increase, and that its acceleration (and possibly top speed?) be increased a bit. If we want to be daring, I'll even float an additional buff: stop the flight time from counting down as long as it's hovering at its max horizontal speed. The idea being that this mount is a good candidate to fill the Black-Spot-shaped hole in our hearts, if only it were actually any good at the thing it seems to be designed to do.