I sort of feel your sentiment, but the reasons given here in the comments are all valid as far as I can tell (for the majority of people, that is, not for everyone). I'm still using workstations but am too considering laptop + dock for the next purchase. Simply because it would mean I can have one device do it all instead of two. Only if your requirements for cpu/ram/expansion are really outside the 'standard' ranges these days a workstation is required because there simply is no alternative.

However one problems with latops, or anything with a small screen which is by default not at eye level when your head is in it's standard position, is that it is probably quite bad ergonomically. I really wonder what is going to happen to all those young people spending hours with their neck bent in what seems a rather unnatural position. I am not entirely sure it really is bad nor do I have the background to argue much about it, but it just seems not right. Maybe someone with a medical background or so can chime in?