would you yell at a medusa getting a point or two in split shot early?
given the newfound potency of mystic snake? yes, I would. You don't need to start thinking about points in split shot until you're ready to start jungling. Similar to Luna. It's not the *only* reason you put points in split shot (you also want to get a couple of points in it if you're ready or looking to push the tower down fast just like you would with Luna).
Also, if Dusa is being given a completely free lane and there's nobody to harass back with Snake,
it should be skipped to get yourself into midgame fighting shape faster. Maxing Q and never using it in lane is fine if you don't want to push the lane. But most lanes will have someone contesting Dusa and pushing the lane to tower is usually undesirable unless your strat revolves around taking towers early. It's just giving enemy offlane XP they don't deserve. Max level snake does stupid damage given laning phase HP levels on most enemy heroes.