75 Agility for tanking

[Spenny121]

I know the magic number of 75 agility has been passed around, however how important is it to meet this goal? I can see a bump in AC by going from 65-75 AC however it doesn't counteract (obviously) having a fungi as a chest piece I don't feel. Do you actually get hit more often below 75 agility, or is it just a negative point, equivilent to monks weight caps?

If it is something that a tank can't afford to have less than 75 of, what good AC/HP items have agility other than CoF to offset the -10 agi on fungi?

This is all for a paladin mind you. Everything I found online has been somewhat vague as to the importance of this number, but everyone seems to agree that its not something to ignore.

Thanks!