I just found a hilarious video of a flying Sabertooth Tiger in Skyrim:

https://www.youtube.com/watch?v=7x9Qw1KSyIs

Why was this fixed? It would actually be FUN to experience something like that.

Is there a mod to re-enable this bug?

I'm surprised that even in the Legendary Edition of Skyrim for PC, players themselves have to fix annoying bugs like the horrendous mouse lag and then completely replace the user hinderface, but Bethesda fixes things that are actually fun to look at.

If it makes you feel any better, they still haven't fixed the "Get hit by Giant, become first Dragonborn on the Moon." bug.

After the first 5 or so times, it loses the fun, and just becomes annoying.

...complaining in disguise...?

Three posts in, and I'm already deleting troll/flame messages.
Stay on topic.

I don't know man. I just overlook these kind of choices and live my life the best I can and get my kicks wherever, whenever, and however I can.

This is not a bug. The Giant's Power Attack is a unique Destruction spell called "crGiantClubSlam." It is intentional.

Not to mention being great fun!