Your package numbers are only true for airlines with weak international First Class products like American and British, not to mention plenty of airlines that don’t have an actual international First Class like Delta and Virgin Atlantic. So again, for premium airline awards, Marriott transfers are weaker than you presume compared with SPG.

The same 270,000 MR points only gets you a 85k-mile travel package with great First Class product airlines such as ANA, Cathay Pacific, Singapore, Asiana, Lufthansa, JAL, Emirates, Etihad, etc. For anyone wanting a good international First Class award, the Marriott conversion is far weaker than SPG.