Anyone that thinks stealth is the be all and end all of Air combat needs to learn more about how air battles are fought. I suggest you watch some videos on youtube of people flying various planes and fighting in DCS air combat simulator.
The most important in any combat is tactics, not capability.
Stealth is overrated. The only advantage stealth provides is a lower detection range in BVR. A stealthy plane might be detected by an X band radar from 30 miles vs non-stealthy plane at 150 miles. That might seem huge but it is not. First of all, low frequency radar can detect stealth planes from 100s of miles. So, there is no element of surprise here. If a country has low frequency radar in planes or AWACS or even ground based radar, they can easily identify where the planes is.
Once you know where the plane is, there are many tactics you can use to defeat stealth. You can design your radar guided missile to fire without a full lock but low-frequency radar given coordinates. Once they are close enough, the missile can lock on its own. Modern AI allows much more complex logic about these kind of decisions on the fly. With AI you can use image based recognition to lock on targets without using a radar.
Even if you don't have these technologies, you can use superior tactics to defeat stealth. Avoid BVR and just hug to the ground and fly low, thus masking yourself from the planes. You can use terrain features such as mountains to hide. Once stealth planes gets close enough to be detected by your X band radar, you can lock and fire.
You can set up approach from different angles. One group can fight from the front to act as decoy while several groups can engage from the side. Stealth planes have limited number of missiles in their bay and thus, they can be exhausted from missile using decoys and then chased by faster planes from the side or behind.
Discussions about air combat here most of the times boil down to which plane has what new stuff. But there is a reason militaries around the world are not going crazy over stealth. Its just a new capability just like having a more powerful radar which allows early detection. A nice thing to have for sure, and raises the chances of winning. But superior tactics and superior numbers can defeat any equipment.
If you run a air combat simulation between 187 F-22s versus (93 J-20s and 93 J-16s), the F-22s will win every single time.
An 100% 5th gen force will decimate a 50:50 4thgen/5th gen force every single time, no matter how many AWACs you have in your force.
The reason why militaries around the world aren't going crazy over stealth is because they are BROKE as heck and 5th gens are expensive to build. That's why you have Russian deputy of defense saying the Su-57 is "too good, too superior to Western offerings", ergo, therefore "We don't need to build it, go for Su-35S instead" type of mental gymnastics. It's the economy, duh.
If Russia had the money, they would certainly go for as many 5th gens as possible.