Plus the fact that you need to be on the switch (I think) to beat mad mew mew, and we all know how terrible joystick controls are on the switch. And the D-pad is in a REALLY inconvenient position for right-handers. No offense to left-handed ppl :3
Yeah, I mainly made this as a joke lol. The only reason I put mad mew mew instead of asriel is because every time asriel speaks, you get a checkpoint in the fight. So, all you really have to do is survive until the next time he speaks, then you can sacrifice yourself to heal lol.