I remember SAP circa 2003. The only think that used XMLHttpRequest (AJAX aka dynamic html) was Outlook web frontend, and SAP web UI. GMail that widely popularized dynamic html did not even existed yet.
"SAP developers" can mean two different groups of people. The developers who build SAP, and the developers who build the custom stuff that clients need. The former can be quite innovative, but the situation with the latter is pretty damn grim (and I say this having worked in the industry, and my dad still works on it)