80% critrate 100 PA = 150 damage 80% of the time, 100 damage 20% of the time. 200 CA = 0 damage 20% of the time. PA on average is 140 damage while CA on average is 160 damage. So even with crit rate cap, having twice as much critical attack as physical attack isn’t actually twice as much.
But wait, there’s more! Let’s say you’re using a skill with just 15% damage boost from enhancement attribute. That 140 damage becomes 161, while your 160 average crit attack damage is still 160. At 50% damage from attributes (which really you should have at least if you’re somehow crit capped), you’re looking at 210 damage vs. 160 on average, so physical attack soundly pulls ahead with even a middling investment in attributes.
Now let’s say you’re using a skill that has an inherent multiplier. Skyliner, for instance - it does 300% damage on bleeding targets, so a 100 physical attack bonus at 80% crit rate for an average of 140 bonus damage is actually 420 bonus damage on average, while crit attack still sits at a pitiful 160. Again, add in attributes and it gets even worse.
So in fact yes, I would say 200 crit attack is worse than 100 physical attack in basically every situation, and much worse in many situations when dealing with modifiers or just high level attributes.
I don’t think anyone is saying crit attack is an inherently shitty stat, it’s just that as it stands now its availability means you will never ever have a build that relies on crit attack. I can only imagine such a build would involve high DEX and lots of multihit skills to really take advantage of the flat, modifier-free nature of crit attack. But the fact that your biggest source of crit attack by far is STR means that a high DEX build is already at odds with that kind of philosophy. Crit attack is simply massively overvalued on equipment and on the stat screen, it is not a .6 : 1 ratio when you factor in very common modifiers, it’s actually a much much less valuable stat than that.