If a saw sucks ass like the one I used a few days ago, you can't safely cut through wood and you end up doing dangerous things like putting your body weight on the top of the miter saw to get it down all the way, gripping the piece closer to the blade to try to get it to cut better with less tear out or to not slip, etc...
There is a big difference between cheaping out on blades/never replacing them and cheaping out on the saw itself. I agree I wouldn’t get the absolute cheapest miter saw, but a relatively cheap one with good blades that are replaced often shouldn’t be significantly more dangerous than a more expensive one.
Both of these engines are capable of making very optimized games, it’s just that most of the developers using them either don’t have the expertise or don’t care to put in the effort.