I think it's because we look at the equipment through UK centric eyes. A lot of gear gets sold in mainland Europe and the States, where the gigging scene is a lot, lot different to over in the UK. I'm guessing that small and light and things like kick back amps are a lot less important when you take the global customer base into account.
I remember talking to EBS about the need for a a small lightweight class D head. They looked into it and at the time, they deemed it wasn't necessary because the majority of the cabs and amp sales were the big units (410s, 610s, 212, 810)... I think at the time, their best selling amp was the Classic 450 - which did pretty much nothing over here - same as the T90... but abroad, it sold well. They said to me it made no financial sense to go to a small lightweight solution as their sales (I dont know about now) were still growing with the larger gear.
Even though there is now a small (ish) EBS class D amp, I still think that was released based on profit margin than anything else. They've killed off pretty much all of their amps - TD660 and Fafner... and all of their cabs are made from a lot cheaper components than when they originally came out. I still believe their bigger cabs are selling better than the small stuff they do.