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because as far as the actual duplication and planting goes, it's significantly optimized.
Did you actually test this? In my experience the duplorcater will lag everyone out, while the duplicator (while still lagging an incredible amount) does not.
I have noticed that the regular duplicator's lag tends to be in massive spikes, with a few milliseconds in between. So maybe, while being a bit slower, it actually gives the server time to respond, rather than letting everyone time-out.
While the duplorcator just does everything in a massive chunk, no matter how many people are accidentally removed from the server.
Idk this is just something I've noticed from experience.