Agreed. I'd think the effort to create isolated outer-rail blocks vs. isolated center-rail blocks would be similar. That is, you'll be creating gaps between track sections and running additional wires to the newly formed electrical "islands". An obvious advantage of the isolated outer-rail method is the amount of current flowing when the block is occupied is negligible...measured in the, say, milliAmps. The isolated center-rail method using current-sensing carries the full current of the train which can be in the Amps. This has implications on the type of wiring used. And has been discussed there are tradeoffs in current-sensing technique. The outer-rail method has negligible current flow as you are simply detecting the presence/absence of the common outer-rail voltage supplied via one or more wheel axles - a relatively simple circuit.
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