If you daisy chain then one point of failure brings everything past it down.
A very good point, I think perhaps the electrician just doesn't want to run all those CAT5e cables. From a cost perspective the CAT5e is pretty cheap. Might run it myself to save the hassle, and stick with the centralised topology.
After thinking about it, a daisy-chained topology would be like the old coax-based 10base-2 networks, where a faulty or incorrectly attached terminator would bring down the entire network. Not my idea of robustness :-)