I have always maintained that combat experience is over-rated.
It is training that is the absolute key. You need real world experience to help make your training as realistic as possible, but if you designed your training syllabus well, with real combat experience influencing and guiding it, then that training is going to be far more valuable then even the most challenging real world combat scenarios.
You want real combat to be easy compared to your training. That means your training scenarios are going to be so hard and punishing, that if it was for real, only a tiny fraction of your men would be alive at the end of it.
That is not just a theoretical by the way, but one based on reality. During WWII, the USN and IJN have very different views on training and experience.
The USN valued training, while the IJN favoured experience.
As such, the USN rotated their best pilots back home regularly, so they could serve as tacticians and instructors to make pilot training as realistic and demanding as possible. That ensured that the quality of new US pilots graduating boot camp and going into real combat kept improving.
The IJN kept their best pilots on the line for as long as they were able, which meant that all of them invariably died. Combat is not just about skill and experience, luck plays a huge part as well, and all the skill and experience in the world could not make up for a fluky piece of bad luck (on your part) and/or good luck (on your opponent's) sometimes.
Real world operational deployments are useful, but only up to a point. For a top fighting force, you want to good mix of real world experience and training.
In my view, the balance between training and real world deployment should be like the balance between study and exams.
You should train hard between 90-95% of the time, but regularly test yourself with real world deployments to see how well that training is serving you out in the field, and adjusting your training plan accordingly if any deficiencies are revealed by the real world experiences.
You can obviously still train while out for long term deployments, and indeed, many training scenarios could only be conducted under such conditions. But the key emphasis should be on training, not deployment.
I think this is where western recent "combat experience" is often way overblown for everyone except the infantry and helicopter pilots. Unfortunately, the relevance and usefulness of combat experience is very much proportional to the casualties you suffer from said combat - you cannot test your limits (and push beyond them) unless your opponent pushes you out of your comfort zone, but that involves losses.
For the navy and air force, against the foes they were/are fighting, and the missions they are conducting, even basic training scenarios are usually more challenging.
All of this means that I think all the wars the west has been fighting has actually been a detriment to western naval and air forces in terms of their ability to fight a high intensity war against a near peer opponent who could actually fight back.
They might have clocked a great many more hours in the air and out at sea, but the lion share of that time has been spent doing mind-numbingly routine missions with effectively zero threat.
The human mind needs to be constantly challenged to stay sharp. Combat deployment is supposed to be the challenge that breaks you out of the comfort zone of routine training, but that just hasn't been the case with any of the wars the west has fought. For the air force and navy at least.