The last comment was a simplification. Going into detail, like what you did

, would have been longer than I would have had time to type up right then, or care to retype in my own words and point of view.
Much of the 'Dragons are OP' issue is the defences themselves. The generically named, and awkward to talk about because it references a concept as well, Air Defence building I personally think is the main issue. It feels like a bandaid fix to the whole otherwise OP air units. You have a hyper specialized, high DSP, few in number, structure, which devolves combat almost back into 'Destroy the Most Important Building to press Win Button' that you used to run into when in the much lower Town Hall levels with your Mortars and Wizard Towers.
If you are a TH6 or TH7 and 'make the mistake' of upgrading your Air Defence, which takes a long time to get back up and going again, you are all but advertising that you want air units to raid you. Verse other Town Halls of the same level, taking down one Air Defence building, hurts your air cover strength significantly, allowing them to take advantage of that sickeningly long window of vulnerability with giant/healer raids, or as a TH7, a modestly strong dragon raid. or minion rushes. And that is verse same level Town Halls, to say nothing of higher level ones. This is why Dragons seem so OP, taking out one Air Defence tower takes out a huge chunk of one's air defences. (see, awkward to talk about)
You just cannot upgrade those things in a way to keep from being overly exposed. Now, with the extra Mortars and Wizard Towers, and of course many Cannons and Archer Towers, I can cycle through those and upgrade them without leaving too huge a gap in defences. But even at TH8, upgrading an Air Defence is still opening one up to air attack, as if you were a newbie player back in TH4 or TH5 with your first Mortar or Wizard Tower. (I Would know. As a TH7, I revenge attacked so many TH8s that were upgrading thier Air Defence, and got a lot of loot from thier 'mistake' of dropping thier guard

)