Unfortunately, the coating will not be an excuse for shortcuts and bad wash habits. You can expect less wash induced marring, though not just because OptiCoat curs harder than OEM clear, but because it simply does not allow bugs/contaminants to bond/stick very well. This, in turn, enables you to remove them with less effort and marring.
OC is not harmed, weakened or removed by harsh chemicals, so you could use a touch less tunnel wash without the normal concern of loosing your LSP. Just be careful not to towels dry afterwards as they usually leave dirt on the surface that could cause marring under the pressure if a drying towel.