What's merit of using "CooldownFrameTemplate" over "AuraButtonTemplate" for auras?

[Layback_]

Hi all,

So, this question would be an extension from my previous thread here.

If there's such issue (well... can't be said as an issue if that's what "CooldownFrameTemplate" is meant to be doing as lightspark says, but I mean in this case), why does oUF utilizes "CooldownFrameTemplate" for auras element rather than "AuraButtonTemplate" or "BuffButtonTemplate"/"DebuffButtonTemplate"?

To be honest, it is not just oUF. Raven also utilizes "CooldownFrameTemplate", as well as the custom buff frame tutorial that I have seen.

Why would all these addons/libraries utilize "CooldownFrameTemplate" with Cooldown frame over "AuraButtonTemplate"?