Exactly. 100% agreed.

Moving rails are ok for people who use small spindles, like a Kress, AMB, or a Makita or Dewalt mini router which have to be clamped right at the end of the spindle (usually a Ø43mm flange) In order to lower such a combo down to the spoil board for cutting plywood sheets Z axes with moving rails have benefits, because they usually can be lowered completely.

But once you start with some Ø80mm Chinese spindles or even bigger stuff, moving rails are just bollocks...