[Chris is me]

I have personally never felt that any legal game strategy is "un-GP" as then it becomes a slippery slope. Next people will be telling me playing any defense is "un-GP", or hoarding balls is "un-GP", or doing anoything that involves your opponent is "un-GP". While one should not win at all costs (i.e., by breaking the rules, trying to work around them, lawyering), if there is a perfectly legal defensive strategy that has existed for years without being changed, I see no reason why it becomes "un-GP" to do it again just because doing it too much is illegal.