Sebo controls and machine details etc.
Like mostly everything SEBO design, it requires the owner to get to know the vacuum in question rather than just rely on the controls or what you've done before.
I never bothered about the way the suction control dial on the K moved but SEBO were crafty in adding that small to enlarged plastic concave acting as the low to high suction indicator.
You can always tell a private company though in the way they design things - the K3 has a fixed control dial since the suction control is on the handle due to the electric hose - but the company haven't made the K3 or the K3 Vulcano a unique design in terms of that concave being removed.
A cost cutting idea maybe but some owners would probably feel they haven't had such a unique machine with the permanent concave set into the plastic for the higher cost prices.
Im not one for fancy dials and LED lights. If a machine has a running light or a bag fill light, then that's all I really like. I've had vacuums before with LED lights showing the suction strength but they soon break in long term ownership.
Another thing that teaches me differently over other vacuums is that SEBO filters for the most part can only be fitted one way. Same with the dust bags. Ever so simple, ever so reliable.