Let's say you votekick someone for autoattacking without using any skills, spells or abilities. You don't need a parser to determine this. It's plainly evident in the log and visible to anyone who cares to look.

They aren't AFK, but they aren't contributing much either. Most reasonable people will agree that this level of play is unacceptable and they should be removed.

Let's say you votekick someone who is using only one skill, but no combos. Or one GCD skill with oGCDs. Or one GCD skill plus oGCDs and buffs. Or one combo over and over, but nothing else. Are any of these reasonable grounds to votekick?

Let's say you votekick someone who hits every positional and executes every oGCD like clockwork, delivering 300% the output of other DPS (you need a parser to determine this). Is this reasonable?

For the purpose of these hypotheticals, assume the accused has not said anything incriminating.

Well, here's the part where I blow your mind: your criteria for a reasonable votekick don't matter.

A legitimate votekick must meet the criteria for one of the four available options in the menu. The accused can file a ticket for harassment and the GMs will dole out discipline accordingly, because differences in playstyles are not grounds for votekick.

Anti-parsers have nothing to fear as long as Level of Play isn't added as a votekick option.