Not really. What I'm saying is that an air defence should be == to a dragon so if there is a 1 to 1 fight, there would be a tie between the air defence and the dragon.
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Again, this is a problem in lower town halls. Try using zap attacks involving zapping air defences like zap dragon in higher town halls or even town hall 9, there is no guarantee you will even get a star if you don't study the base and just spam the dragons. Hence, they are very easy to use at town hall 8, like you have mentioned before, but at higher levels, they do require skill.
Th8 is supposed to by easy Def4. It prepares players for the real clash. Clash of clans wants you to(not said by them, but they don't bring updates frequently to lower town halls)upgrade to th9 or th10, and not perma-max a lower town hall. Like you are for th8, there maybe a person at th3 who likes th3 and often complains about barch being too powerful at that level.
Honestly the problem to me has never been lightning, its the higher lvl loons. Being able to use max loons as max grows stronger over time makes th 8 easier. I have a th 8 base that I consider pretty easy for dragons but drag zap has never 3*ed unless the attacker has lvl 7+ cc loons.
We've been through this, TH8 is not "in the middle ground territory". Considering it you can get through TH6 in a week and most upgrades at th13 individually take upwards of two weeks, Th8 is so much closer to the beginning of the game than the middle that's it's not even worth discussing.
The only defences in the game that will beat a heavy attacking troop in a 1:1 fight would be a single inferno tower, and maybe an xbow.
At TH8, you have Pekka available. There is no TH8 ground defence that could beat a pekka 1:1. At TH9+, xbows might if the pekka had to start at the extreme range of the xbow so would have several seconds of being shot at before being able to hit back.
So why should a single air defence be so powerful it can do that to a heavy air troop? It is actually pretty close if the dragon starts out of range. A TH8 Ad takes 10 seconds to kill a max TH8 dragon. The dragon takes 6 seconds to kill the AD, but only has a range of 3 while the AD has a range of 10. So the dragon will have about 3 seconds of being shot at before it comes in range to shoot itself.