I wouldn't say air power is everything, though it certainly is important.
Israel learned that the hard way in Lebanon, when they tried to launch an air campaign against Hezbollah, and failed to achieve any objects. Hezbollah merely changed tactics to counter Israel's unchallenged air superiority, until the Israelis were forced to launch a ground offensive.
Similar situation in Yemen, where the air campaign launched by Saudi Arabia, and its coalition partners failed to achieve any real military objectives. Once again, KSA and its coalition partners were forced to launch ground operations to stop the Houthi offensive against government forces.
Air power can only do so much; if you dont have any ground troops to secure the areas that were bombarded, the enemy will simply come back to reclaim those areas.
Essentially, once air superiority is established, air power becomes another form of artillery strikes. It's used to soften up the targets for an eventual ground offensive, like Pakistan did in Swat against the TTP. Pakistan used the falcon drones, along with the JF-17s to find and bombard TTP targets, such as hideouts, ammo depots, bomb factories...etc. once that was done, the army moved SSG to secure key areas, and regular infantrymen to clear out the rest of the valley, and regain complete control.
Getting back to Armenia, while Azerbaijan's drones have done a lot of damage to Armenian armor, and stationary targets, Armenia is still deeply dug in, and these strikes haven't done much to counter Armenia's terrain advantage. Armenia still controls the mountains and hills, so Azerbaijan is literally and figuratively fighting an uphill battle.
The Kargil skirmish between India and Pakistan shows just how deadly having the high ground can be, once a military forces is deeply entrenched. Pakistan, with a few thousand soldiers fought off tens of thousands of Indian soldiers, and India's air strikes did very little to weaken Pakistani positions. This coming weeks will see Azerbaijan and Armenia fighting potentially dozens of kargils, where Azerbaijan will have the numbers advantage and air superiority (like India had), and Armenia with its field advantage (like Pakistan had).
