They don't feel the same at an element level, though; at least not to me. The speed of action is greatly increased, the spread of abilities is reduced, the style is more focused and less meandering - the overall feel the game itself is simply quicker. In Classic, for example, taking one 1-2 mobs is something of a challenge when the levels are equal - it involves a degree of micromanagement between kiting one mob while focusing the other. In BfA, by contrast, I can easily wade into combat with 6-9 Naga mobs in Nazjatar and mow them down without ever really feeling in danger and with no sense of micromanagement of my abilities - I just AoE up a storm and everything dies and I'm at 80% health (then 100% again when I Death Strike a nearby mob to max myself).
Slower paced action feels more to me like a second generation MMORPG, whereas faster paced actions feels more like an ARPG (more "Diablo" than "Curse of the Azure Bonds"). The button setup and UI don't matter overly when the pace of the game itself feels altered at the foundational level. And again, I'm not saying fast pace is a bad thing on the face of it - I actually kind of prefer it these days, as I tend to play on shorter shifts and I like to get what I want to do done in short order. Just remarking on how the game has changed compared to its earlier incarnation.