I agree each program has their pros and cons. A hot breakfast is a weak point at Bonvoy whereas Hilton has that base covered better and more consistently (even with the recent domestic $30-50/day F&B credits).

The thing that grinds everyone's gears is the uncertainty and inconsistency. If I want the certainty of a "guaranteed" 4pm late checkout, I listed my options above. An alternative for Hilton props if you want to guarantee late checkout is to reserve and pay for an additional night... judging by the recent Hilton/Conrad Vegas rates, the market has spoken. Frequently you can buy 3 nights at the Conrad Vegas for the price of 2 nights at Cosmo (Bonvoy) or Aria (WOH).