That is an inaccurate statement lol. You'll see most farmers have max heroes before walls, especially the TH10s. I had 30/30 before finishing lavas at TH9 and 40/40 at TH10 with about 50 zaps left.
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I disagree with the lava part. There is no way to speed up hero upgrades unless you spend a lot of money, but you can certainly farm more for walls if you so desire. Several people in my clan have lava walls but only one has lvl 30 heroes. This is even more true if you war regularly.
Lots of pump raiders are incapable of getting large amounts of DE. Raiding full drills on the outside of the base with barch or gobs is much less of a thing than full mines/collectors. Bots aren't very good at funneling to and targeting DE either.
Some people want to war, not sit out for months.
The problem of "I can't upgrade heroes and war" is NOT solved by saying "don't war"
i have them at 14/13 and all maxed th8 defenses and um like 220 legos walls i plan to go to th10 new years with maxed everything
A lot of people put off heroes due to warring or using armies that cost way to much dark elixir for farming. I quite often see people using 36 hogs in a farming attack. There is a reason their heroes cant keep up with their base.