It's no secret that Gamebryo is buggy as hell, did you play any of the older Bethesda games? The engine dates back to around 2005.
We've had that discussion already...sigh...
Gamebryo was an abortion for running a complex, and absolutely huge, world. It had known issues with this from the day that Bethesda licensed it, but they still did. Fallout 3 was...the worse off upon release for using it. New Vegas did better, but not a lot.
Bethesda claimed that graphical fidelity was a concern, and therefore developed the Creation engine for Skyrim. It's functionally Gamebryo with much better graphics (the "reason" for dumping Gamebryo). At the same time, it's debatable how much of a new engine this is, given most of the Gamebryo commands and functions still work perfectly with Skyrim. Creation is what Fallout 4 was built on, not Gamebryo.
Now that I've sullied myself, let's be real. Gamebryo was an engine to license, because Bethesda couldn't be bothered to make their own. They've continually stretched its limits (well past their breaking points, as demonstrated by the bugs) over the past decade. Rather than break down and develop their own proprietary engine, they've focused on creating huge chunks of content. The content is actually worth while because of things from the modding community, such as the script extenders and various community patches/anti-crash mods. I can say without an ounce of doubt that I don't want the people at Bethesda writing their own engine from scratch. If the community is necessary to fix their patchwork from what is functionally the decade old updated Gamebryo, I don't even want to know what an abortion something they did 100% might be.
If anyone is still considering it, this is why paid mods were absolutely crucified. Bethesda games are never stable enough to not warrant patching, they generally stop patching short of fixing 98% of bugs (seriously, look at the bug pages for Skyrim even now), and they are allowed to do this because someone fixes their crap out of sheer love for the game. If you suddenly have a dozen different "game fixes," which eleven people are charging for, you get the idea that the community is greedy. The truth is one modder coded the patch, and 11 unethical weasels copied their work to sell for profit. Modders deserve more than words to support their work, but at the same time Bethesda doesn't deserve the majority of sales money on something they can't be bothered to patch themselves. I know this is only one facet of the issue, but it's enough to make all other parts of the paid mods experiment with Bethesda completely unpalatable.
