The way your frame it is wrong, you make it sound like Gobert is the one being targeted when teams go small, when they in fact target the complete lack of perimeter defense from the other 4 players and also the fact that they are relatively small. Playing small ball against Suns isn't a viable strategy because they arguably have the best set of perimeter defenders in the league. For teams that can it's a very good idea to drive and kickout when you reach Gobert because no one is going to prevent you from driving and no one is going to mark your teammates on the outside.
If anything the Suns should be a good example of how you can use a true rim protector with relatively small players around him. Both Gobert and Ayton need little help inside and ideally they don't have to find themselves defending the perimeter often, with or without help. The other option would be to defend like the Bucks where Lopez doesn't defend the perimeter with too much aggression in fact they dare you to beat them with threes and deny the inside. The Jazz do neither of these things, they don't defend the perimeter and they leave Gobert alone inside, he is generally enough of a menace but when you reach the playoffs, you face the best offenses in the league, you can't have a one-man defense, the other players have to provide something.