I'm having to paraphrase a bit, so maybe not doing the best job of explaining his reasoning.
Equalisation of yourself as an anchor piece is necessary in the scenario. By using the tie-in, the equalisation to the anchor can be "better" (more equalised), as there isn't another link (ie, your harness) in the chain. Tie-in with a bowline is advisable as they're not susceptible to cross loading.
I feel like I'm doing a bad job of explaining this. |