Why olympus map is so bad

So much to say here.

Everything you've pointed to as a detriment is, in my opinion, a selling point.

The multi-path center of the map? How would you restrict flow without boiling it all down to a handful of chokepoints where your aforementioned campers would destroy you with ease? The point of having so many ways in and out of the center is to make sure that you have alternatives if a given route is contested. Assuming you've left yourself enough time.

As for rotating through the phase runner, top to bottom or bottom to top, you seem to forget that the phase runner itself is an option. As are two strategically placed jump tower, one west of Estates, the other west of Gardens. And have you ever counted the number of Tridents on this map? I know a lot of "skilled" players who would rather get gate kept and deleted than use a Trident, but these are the tools the developer has given us and if we ignore them out of vanity then more fool us. Or have a Valk on your squad. Or any one of a number of other mobility legends. Or a mobile jump tower.

And possibly even more important is this: I've rotated through the phase runner a million times and I've almost never been caught there. And I'm almost always soloing. The trick isn't so much where you go as it is when you go there. It's knowing where and when other squads are on the move. Player behavior in this game is so utterly predictable that I'm honestly surprised that there aren't routinely 10 squads at the final circle.

I keep coming back to "imagine one team camping while you’re trying to rotate, and then there’s also another team behind or near you." If this is a situation you find yourself in a lot then it might be time to stop aim training and start learning how to strategize for timer and position. You should NEVER be running out of time to execute your rotation even if that rotation starts at the point farthest from the next circle, AND even if your desired point-of-entry to that circle is on its far side. The second the next ring shows on the map then you have to KNOW where it is you want to be (not where an easy fight will be, but where good position is to be had for the endgame) and you have to KNOW exactly how to get there without running into an enemy squad. It's painfully easy to do but most players just don't even think in this way. They drop, they loot, they move in a straight line to the nearest point on the next circle even if they have to move through three dangerous POIs to do it, and even if that point just inside the circle is a guaranteed dumpster fire of a multi-squad pile up. If you're routinely ending up in situations like these, and your post makes it sound like you are, then the map is not your problem.