A lot of the gaps will be there because there is not enough head room for the wires. In that case whatever caused the missing head room would rip off the panto

A lot of the gaps will be there because there is not enough head room for the wires. In that case whatever caused the missing head room would rip off the pantograph. Since you need the pantograph-lowering feature anyway you might as well use it everywhere and avoid having to build the smooth-rising smooth-lowering cables.