There’s a lot of interesting discussion you can read about active buffered multiples in this forum post.

The Visible Signals Video Mult takes the cheap and cheerful road to solve the main problems discussed in that post.  However, it’s not absolutely perfect: a “perfect” buffered multiple would use a lot more op-amps (an extra one per output) and maybe even omit the protection resistors on the op-amp outputs (to completely eliminate all CV loss via the voltage divider formed by the op-amp output protection resistor and the grounding resistor on the input of the destination module – but that comes with it’s own risks and downsides!)