A modest suggestion for making Plat lounge access comparable to Citi Chairman:
Keep the current arrangement where you get into the lounge of the airline you are flying on, with guests. Plus, 10-20 Priority Pass credits for when you are flying a different airline or an airline that does not have an agreement with Amex, e.g., UA.
This would allow Amex to keep the presumably lower cost agreements it has with the current carriers, but give card members more flexibility at a small additional cost to Amex.
Without this change I may switch to Chairman next year. The lounge program is much better (unlimited PP, with 2 guests) and the other amenities are the same (except FHR?).