I'm not going to argue with you any more. Clearly you have your head set against Petra and Hubble, but you also have zero clue what Petra gives.
On the contrary, I've argued very strongly in favour of Petra on the Wonder threads, and it should be higher both than it was in that list and than Hubble.
My point is that what makes it good is not that it's a 'win the game' Wonder. Often it isn't. You have a view of what Wonders are for that seems excessively parochial. Some Wonders help with victory, others help with short-term game position, some help with both. Petra does help with both, but by far its greatest value is its importance for improving the value of one city. Hubble is essentially worthless as anything but a win condition.
Petra gives 1 food for all tiles, and 1 hammer on hills. It also gives you an extra trade route and caravan. The caravan alone is worth Hanging gardens, and you get food and hammers as a bonus.
I'm well aware what Petra does. I'm also well aware that, when the Wonder is available, hill tiles away from rivers produce exactly 0 food without Petra. Hence my contesting your claim that your Petra cities will mostly be working tiles that produce more than 3 food - aside from sites with lots of flood plains and oases, this just doesn't happen, and Petra is most valuable in sites with lots of hill tiles.
And no, there isn't any way a caravan is worth a free 6 food bonus even ignoring (as you seem to throughout) the extra National Epic that HG provides. You will eventually reach a game stage where a caravan can supply 6 food, but that's much later, uses a trade route, and is vulnerable to attack. And also doesn't come with an attached National Epic. If you replace the caravan with a cargo ship, you're replacing your free caravan with a unit that costs a third as much as the HG itself, and still has all the above vulnerabilities in addition to very exacting geographical requirements (you need two cities on the coast, and of these the capital also has to have substantial amounts of desert unless you manage to pull off Petra in a secondary city).
Nor is 6 free food in any way equivalent to working 6 tiles for 1 extra food apiece. You seem to be drastically undervaluing the importance of food as a resource, especially in the early game, nor do you seem to appreciate that 6 food early is not equivalent to 6 food when you have Civil Service and enough pop in the city to gain a surplus to match the HG's output. And that's ignoring the fact that - as discussed - Petra cities are most often going to be in food-poor sites and you'll have a long wait getting them to 6 pop before you have Petra.
As for Hubble, an instructive example of what I'm talking about - principally, its reliance on other Wonders to get you to a point where it's going to make a difference - came in my most recent game.
The end-game situation had Brazil nearing a cultural victory; five civs were left, and a Brazil-Shoshone alliance seemed to be systematically wiping out the civs that Brazil did not dominate (and Assyria, which it did). When I won the space victory, the culture screen had Brazil perhaps 4 turns away from becoming influential with the final civ, Morocco.
Superficially, this is a game I wouldn't have won without Hubble: I needed the scientist boost and I needed the spaceship production boost. This is itself an unusual situation - where the rival for victory was not a science victory, but a cultural victory, in the unusual case on an 8-civ map that one AI civ managed to obtain all of the relevant culture Wonders.
But Hubble was one of six Wonders I built (I captured Machu Picchu). A turn or two away from defeat, I needed most of them to win. Without the Porcelain Tower I would have been one GS shorter and wouldn't have had the benefit of repeated research agreements with Brazil and the Shoshone. I only just had the faith to buy enough scientists and engineers; without Borobodur I not only wouldn't have had that, I also wouldn't have had the steady 20+ gpt income from Tithe that I did - later on I had too much gold for this to matter, but it was valuable in the earlier game.
Those are the most obvious cases (I don't actually recall what most of the other Wonders I built were. EDIT: One was the Oracle, but its value is extremely hard to quantify. I did use it to finish Tradition and so gain a consistent food boost - and aqueducts - from an earlier point than I otherwise would have), and in terms of time saved on victory I suspect without running the numbers that Borobodur at least - and probably the RA boosts from PT - outperformed Hubble.