So,zero ATP points unlike a bunch of others who went there instead of junior tournaments.Is there some strategy behind this or...
well as you can see in this thread and in the media, players who are ranked number 1 in juniors or win junior grand slams are very much hyped,
being ranked 1000 on the adult tour is not that rewarding and pleasant
Which means that by focusing only on juniors, you can at least have a reward in tennis at some point of your carreer.
In the past, French players were specialist for that : how many junior number 1s have we had, you would be very surprised : probably around 10
it can be one reason for such a strategy.
Another reason can be that you're not enough physically mature yet.
Usually the best juniors play junior tournaments until they are 17, sometimes 16, but if you're not physically mature or just not good enough (I think Milojevic is in the latter case), you can keep on until 18 and try to have some early rewards (for instance, Monfils won many junior grand slams when Gasquet left the junior Tour, whereas Gasquet was the same age as him and dominated him before : quite funnily people keep on putting their results among juniors at the same level whereas it's completely different : Gasquet did it at 16, Monfils at 18)
At 18 years old or even at 17, great juniors like Quinzi and now Edmund think the junior Tour is a little bit too easy for them, and they will learn more about tennis competition, stamina and everything, by playing in futures.
Also their focus is mostly on managing to have success among pros, making a real good professional carreer, rather than on having short-term rewards.
There have always been players who have nearly skipped the junior Tour. For instance Nadal, Djokovic or Berdych hardly played junior competitions.
Recently, I've heard in France that it's a better learning experience to play futures (the French have completely changed their strategy about that comparing to the past and all of our "junior number 1s") but it's also a tougher one, including because you're quite anonymous in futures, not like in junior grand slams.
And as players tend to mature later nowadays than in the past, it may be better to delay that very tough experience for a moment when you're readier. Seems that it's what Milojevic has chosen to do, as Peliwo did (Peliwo doesn't seem to be the best of his generation either, but Saville and some others focused much more on futures than him)