The suggestion to have runs more comparable is reasonable.

We can see that overclocking and Steam are significantly faster than arcade hardware as shown on any leaderboard. We also don't have enough submissions for several distinct categories. Maybe we'll have a ton of runners submitting, where we do need to separate categories. But right now, do we need separate categories?

Why is Hard difficulty being excluded? It might not be popular but it's in the game. Why should the Arcade category include MAME, Wii VC, PSN(PS3/4/Vita), XBLA? Do these platforms emulate the game accurately?

The Steam version is an official release by SNK. It's faster, why are we separating it from the other categories? If that's the case, then we should have a PC only category and run Metal Slug Anthology as many believe it's faster than Steam. This game is fairly old and is unlikely that an SSD is faster, but it's possible is there. Should we note people running on SSD or create a separate category?

Now we have a ton of categories, what gets to be the main one? We can argue that official hardware is the front page page or authenticity, or the PC version because it's easily accessible an more people have a PC than console, or the overclock category because it's the fastest.

Lets say arcade gets to be the main platform for Speedrun.com. Everyone who has a Neo-Geo, MAME, Wii VC, PSN(PS3/4/Vita), XBLA remains the same while those on PC has it's own tab, where at this point there would be 7-9 tabs cluttering the page, or we group PC, emulator, and overclock to the miscellaneous drop down, unlikely to be seen by users browsing the game. Someone is bound to ask if PC is an "official" release or not. Not many people know what MAME is, but it's also an emulator. People that own a console may be encouraged to buy an affordable game ($20 for Anthology), or discourage those who don't have consoles as it's an additional barrier(s): financial costs, console for 1 game, a capture card for Neo-Geo.

At this point, I would feel pretty bad having my runs never to be seen by people browsing the game. I'm not saying I'm good at Metal Slug, but I at least put effort. I use a laptop that loses 1-3 frames per second just playing the the Steam version. I might as well drop Steam and run only overclocked emulators. Arguably I could run MAME, but that's also emulating the game.