I do Amex plt and delta Amex plt. I have my kids and my wife as AUs on the Amex plt.
-lounge with plt
-flight certificate with delta plt
-I only occasionally get mqm waiver via amex delta. I try to not chase sky pesos due to their low value
-I can “pay for” the amex plt via the $300 credit + the various discounts in the year + club access
I don’t do the reserve because i probably wouldn’t buy a companion F ticket and I can’t get enough AU cards on the reserve to cover my family.