BravoV - fully agree. The fixed leads are terrible. Way too bulky for certain applications and frequently requires some sort of extension or adapter...ends up looking like a dog's breakfast.
Worst, as the HV probe usually was used in HV environment that are harsh, rough and tough places like generator set, big motor or big thru hole components that may be hot, not the type of probing condition that you're going to use like in low voltage SMD board that usually done at bench top.
And at the rough places, usually after a while. the cables are doomed either get crushed, bent like hell, chipped, touched hot part like heatsink and etc, and ended with ugly and probably unsafe probe cables to work with.
With banana style input, we just throw away the cables and buy a new one, instead of the head-ache have to open the probe body, find a suitable cables, de-solder and solder the replacement cables and etc, totally a ship wreck.