With new AGESA it is not a problem to reach 6400 or even 6600 MTs anymore.
The main thing is to keep the controller at the 1:1 ration and then go all the way up + optimizing the timings.
AMD calls 6000 MT/s the sweet spot for Ryzen 7000 CPUs. It's in their review guides. As far as AGESA getting easier for 6400 and 6600 support. You'll be surprised how many systems still have problems with this. From the ones I retested (that didn't work at all before) they either will set it to 2:1 ratio after failing to boot a number of times or jam a ton of voltage in just to be bootable. Either is not ideal.
Now say you have a MB motherboard and CPU that happily does 6400 plug n play. Now for best performance, changing the FCLK is recommended. After playing around with SoC voltage and a few others it's stable for daily use. At that point might as well just go to 1.45v and drop the timings yourself.
If you done all that, this Patriot Elite 5 is absolutely not for you. Budget memory for people just want to plug in and go. Not worrying about the best possible memory tweaks or chasing that maximum frame rate.
Of course if you can find better memory for the same price or cheaper, buy that instead.
But I definitely disagree with the "generic recommendation".
Noted