While there are no doubt those who love seeing their screen filled with numbers every time they full the trigger one hopes there's an option to turn them off.
Watching JMMO/RPGs in particular I see lots of colors, movement, effects, numbers (and oversize weapons) and can't help but wonder if they're designed by/for 10-year-olds. Hell you can't even see what's happening 90% of the time because of all the graphics spamming the screen.
They're designed for the general populace by developers and animators that aim specifically towards their target audience, usually ages 10-mid-20s. J-anything is always heavily exaggerated for a reason. Their movies, music, games, and everything all follow a certain set of standards that are all about flash and attracting attention. Their normal lives are already so painfully boring and stressful because of societal norms, so the hyper-exaggerated media they consume lets them escape from that in the same way that we escape with
our media.
They're used to that specific style of combat too, much in the way that anybody that's regularly seen it is. Like Devil May Cry. It's Japanese down to its very core with its flashy action, and if you grew up on high-action games like that, you come to expect it. The bigger the number, the more powerful you feel, as well. Nobody cares about a slugfest between generic thug one and two.
Everyone cares about a slugfest between Superman and Doomsday. That's why people get bored at doing one damage versus fifty health points, but get excited doing one million damage to equivalent health points.