external display via HDMI and remote control via web works pretty well and fast. So its not a big deal.
I disagree. When the primary display is touch screen, and the UI is touch orientated, external monitors and mouse-based web clients don't provide the same user experience at all.
Of course, maybe not everyone uses or appreciates a touch interface on their 'scope. I too, originally thought it was just a gimmick. Then I owned one, and later a touch UI AWG, and now I'll be looking for it in future such purchases.
It's not a hill I've a special interest in, let alone one I'm prepared to 'die on' but given the nature of the UI Rigol has developed, which includes windowing capability, and given this device (like the DHO900) has up to 16 LA channels to display too, I find the lack of primary display real estate to be disappointing in this era. In this price class, I'd prefer to see nothing less than the 9" of the 'old' MSO5000 series.