Performance mostly. But also even when made by various AAA studios, the resulting games often have this uncanny similar-ness to them. Personally i prefer in-house engines even if its just to maintain variety in the industry.
Also obligatory shout out to id tech for continuing to show off their engines with indiana jones.
I’m also on boost, it shows fine for me. I don’t even see a setting to enable censoring an individual word in comments. Just posts.