Because of the nature of the ported GoldSrc maps, the training does not rely on completing specific actions to advance. You can complete the entire hazard course without ever gaining the HEV suit, because it's not connected to the door, the trigger around it is. The delay is so the HEV plays its introductory voice lines.
I like the idea that Gordon was so late to the experiment the train left without him so he needed to grab an HEV suit from somewhere first and then just walk on monorails all the way to the testing lab
10:47 This is why Black Mesa posed such a threat to Aperture, they had break dancing parties for their staff so wild even the soldiers had to stop and join in.
The entity duplication thing with HL:DM Source is actually the worst thing, like I used to play it with my brother, and our matches on Stalkyard would devolve into me hiding getting stuck inside a crate because the "door"(?) would duplicate and prevent me from leaving, then immediately being obliterated with SMG grenades.
Needless to say, when I convinced him to use the original Half-Life for deathmatch, the experience became a lot more enjoyable.
My god the tutorial levels are a work of art. Fascinating to see it struggle to load all of this; it’s like the game equivalent of moving all your furniture slightly to the left
you have completely destroyed my argument