With all due respect, I have already seen that you like to debate this same topic on other channels and honestly I don’t feel like debating, but I think your problem is misinterpreting a chart or misinterpreting what you read on the internet.
F-14 can perform sustained turns of up to 8.5G, without bleeding energy or speed in the process (it is the definition of sustained turn vs load factors) and without the plane breaking up (it is a guarantee specified by the manufacturer that the plane is capable of doing so without risk to the aircraft).
Another thing is the maximum G that an airplane can support prior to structural damage. Could it do 10G without breaking? The plane yes, probably the one that breaks is you, or you pass out and end up crashing the plane before you regain consciousness. Is the plane going to break for reaching 10G? not immediately and if it is not sustained over time, before then the plane will bleed energy, speed or start to suffer damage. That is, the graph does not tell you what is the maximum G that you can do with the plane. The graph simply warns you not to exceed the limit.
Then there are the planes governed by FBW:
Could the F-16 support 9G? Yes, and even more, but it is limited to 9G to preserve the life of the pilot.
In fact it was designed so that you can command 9g’s
Can eurofighter support 9G? It can theoretically support 15G, but is limited to 9G to preserve the life of the pilot.
F-18 is limited to 7.5G, but is the maximum? No, it’s the accepted limit, but you can unlock it with the paddle switch behind the stick and increase the available limit even to 10G, but it’s not the maximum it could do, but what the plane lets you to do.
How are these planes limited? among many other things, limiting the maximum deflections of the control surfaces vs dynamic pressures so that even though you do full aft stick, the plane doesn’t do the max deflection, or hardening the stick so that it is difficult for you to do so. If a stabilator has a maximum deflection of +30/-10, an AFCS, DFCS or FBW will limit it depending on the dynamic pressure: at low speeds or low dynamic pressure you will have those 30+ available, but at higher speed it depends on the manufacturer, but It could perfectly be < 30%, or what is the same, < +10/-3. And therefore you won’t be able to pull G’s.
In conclusion, it’s not that the plane isn’t capable of doing it, it’s if it lets you do it or if you can survive it.