User blog comment:Ghmorello/Chapter 895: No Step On Snakeman!/@comment-24850639-20180216153026/@comment-64.9.54.250-20180224234751

I think the point of Snakeman is specifically to counter Katskuri's haki. Luffy used a similar tactic with gear 2nd against Boa Marigold and Sandersonia before the timeskip. The attacks may not be as heavy as bounceman, but he has the speed to hit Katakuri, and I think that is what Luffy needs most in this fight.