What's changed for me is the increase in the choice of BBQ equipment, accessories and supplies now available in the UK, by no means the choice that there is in the US but it's certainly easier than a few years ago. The emphasis on focus of BBQ has also shifted towards competition rather than just backyard warriors, I don't actively compete mainly because I can't find the time but if I wanted too there is now an active circuit to participate in. My biggest criticism though is with choice increasing there is a growing need for people who want to know they are doing the right thing or buying the best equipment, the truth is there is no true best equipment it's about the technique, true that good equipment makes it easier but there is still a basic requirement for learning the skills of fire management, smoke balance and choosing flavour that compliments without detracting from the food you are cooking
For me though the best change is the feeling of not being stuck with this hobby (obsession) on my own