I always loved how in Questionable Ethics it became apparent to the player that the scientists had already encountered these Xen aliens before. There are multiple rooms were alien grunts and headcrabs are kept for further study. This was then further established in Opposing Force, the Biodome Complex for example.
There were also some seemingly pointless cases in HL1 that didn’t seem too scientific, like the cage filled with half a dozen headcrabs that were then electrocuted with no apparent furthering of how these things live.
But I would love to see some more of this in BMS. Like glass cylinders where dead vortigaunts are suspended in liquid, or a small observation room built into the wall where you can see a (living) houndeye. And also some dissection tables with dissected headcrabs and maybe some headcrabbed HEV scientists since there must certainly have been some cases of the science team sent to Xen being headcrabbed.
So what do you think, any chance to see some of these ideas accepted?