I don't really have trouble keeping myself to, like, 1.2 coffees a day. I can't imagine drinking 6-7 coffees in a day to get to 800 mg caffeine.
Unless you add ice or sweetener it's bitter and hot, so it's a lot harder to slide down the slippery slope of just drinking it whenever you're thirsty and simultaneously getting addicted to the caffeine and the sugar. To say nothing of whatever else is in the energy drinks.
Although I guess plenty of people who drive a lot do this with the sugary Starbucks drinks in the giant mugs.
So, we can haggle over details, but overall I don't see a dramatic qualitative difference.
I will say, though, energy drinks do become a relatively expensive addiction. A Monster energy drink can easily cost 3-4 dollars, so if I had three of those a day we are talking $10+ of cost. If you get off brands they're cheaper, but even still I think they're overpriced.
I know it's a meme that people pay like $6 for a coffee at Starbucks, but I think if you buy the coffee beans yourself or instant coffee it's relatively cheap.
Eventually I transitioned to the Aldi brand which was I think around $1.
I guess it's cheaper in Europe.
Still not saying it's healthy but it wasn't because of too much sugar.