When using a power conditioner, why is it advised to run amps directly to the wall?

I demo'd many over the years through lending library at Cable Company, didn't find a single one that didn't limit current to some extent, this includes passive and active. This also compared to my own BPT 3.5 Signature witch has a massive Plitron LONO balanced transformer which also does same even when I run it on the amp/bypass circuit.

These comparisons mostly done with 845 SET amps which demand much current. To this day no PC for my 845 or 300B amps, I run my amps alongside 2 REL subs from a single dedicated 20 amp, 10AWG circuit, don't need or want PC here.

For those of you claiming they limit current, did you have a way to actually measure that or was it by what you thought you heard?

I read a review of Moon amplifier where the company recommended plugging directly to the wall and encouraged the reviewer to experiment. 
 

I have tried plugging into the wall and through power distributor (Shunyata). I prefer my amp plugged into the distributor. 
 

Your system has 3x the amps I have though - consider emailing McIntosh and asking there recommendations. 

Thanks for all feedback everyone. The issue seems to have many opinions dependent on many different situations.

 I have had literally everything in my rack plugged into the Mac power center for nearly 16 years plus I just added a big powered sub a few weeks ago. It sounds great and I have had no problems at all. BUT, I think I will take the suggestion above and contact McIntosh to be sure. 

My take on direct into the wall is some conditioners can't pull the amps for transients or they bleed into the digital if not separated in the conditioner. Because my power at least 2x a wk has problems I can't go direct to wall. To divert that problem I use furman 20 i that has capicitors to provide > 60 amp transients the audioquest has the engineered that designed furman then went to audioquest. He has a magic box ie capicitor of sorts in model 50090 and 7000 that do the same.so far i have not noticed a decrease in sound quality. I have some conditioners i plug the hagel h30a or bryston 28b3 and it will go into limp mode and turn the amp off.i have not had that problem with the 2 I mentioned. I should throw the big shunyata in there as well and not had any trouble.enjoy the hunt.