new grab pickup system at suvarnabhumi airport sucks

I’m not sure if it’s at Don Mueang as well but I just landed in the airport and upon walking up to my taxi stopped on the road at the grab pickup point, the grab employees blocked me from entering even when I showed them that was indeed my taxi. they said I’m not allowed to get in because it needs to park first but I’m like it’s stopped right here in front of me why can’t I just get in and they just keep saying no no cannot. so I had to walk alongside my taxi as it crawled over the course of about 5 minutes to the designated parking lane before the staff stopped blocking me from getting in. what the fuck is the point of this??