I have the last thread
here , I made it. And it makes perfect sense to me that attack speed is not equalised.
First, attack speed refers to the movement speed of the attack itself. Normally this is identical to combat speed, especially in fist-fights, sword fights, etc, and isn't worth mentioning as any different, or whether or not it is unequalised. However projectile attacks often move faster than the user could themselves move or react to, e.g. average human speed human with a gun shooting subsonic+ bullets. I see no problem with this. If we equalised the attack speeds of two peak humans with guns, then there would talk of them just reaction dodging and ducking under bullets, which is ridiculous. Also, the attack speed of a melee fighter will generally be the same as their combat speed, unless they have some ability that makes their attacks faster than they themselves could react to, for example Teresa's quicksword, which lets her attack at Sub-relativ speeds, but does not allow her to fight at them, if that makes sense.
Attack speed being unequalised is not unfair either, it is simply an advantage on the side of the person with the higher attack speed, just like any other advantage given by abilities or resistances. A higher Attack speed is not enough for a blitz to be called. For example, When two hypersonic characters fight each other and one has some form of projectile attack at lightspeed, aim dodging is still possible, as is countering the preparatory movements of the lightspeed projectile. The hypsonic character without the lightspeed attack can still react to the hypersonic movements of the other character who is preparing their lightspeed attack.
Certain higher attack speeds also are the result of some inherent property of the projectile itself, and so equalising them doesn't make sense. Reinhard Heydritch's spear ignores all distance (covers any distance instantly = infinite distance / no time = infinite attack speed). Christopher Valzedile's Gamma Ray is him shooting weaponised Gamma rays, so obviously it is lightspeed.
Again I must stress that a higher attack speed, when all other speeds are equalised, does not necessarily make it a bliz or unfair. The preparatory movements of the faster attack can still be reacted to, and an opponent can still do something to stop the attack from occuring, or get out of its way or prepare a shield of some sort before the attack begins.
If there is some other inherent property of the faster attack that makes dodging impossible, this is also not unfair, anymore than it would be if speed was equalised. Saber's Excaliblast has a massive width, and is probably going to hit anyone she aims it at (except teleporters and the like), whether the excaliblast's attack speed is equalised or not. Reinhard's spear will never miss, so even if we were to equalise the speed of the attack by removing the infinite speed, it will still hit eventually. So just because the movement of an attack is A) extremely fast and B) the opponent is going to get hit, does not necesarrily mean it is unfair, as there could be some other reason as to why the opponent will be hit, such as AoE.
While not equalising attack speed but equalising other speeds can sometimes lead to problems, such as a peak human with a subsonic+ gun being equalised to FTL, making the gun useless at its attack speed is still subsonic+, this can still be easily fixed by simply always equalising speed to the lower speed. And if the character has some supernatural ability that is purely based on their speed, e.g. timetravel by moving FTL, I believe it would still be acceptable for them to have access to this ability even if their speed is equalised to lower than FTL, for the sake of not disadavtanging them by removing a power of theirs.