.... I am a little puzzled as to why #1 is still considered a par 5? Pros are hitting 7-5 iron in and many par 4's are now over 500 yards for Touring Professionals. Why the insistence on labeling it a par 5 when everyone in the field easily reaches it in 2 shots?
PL, the primary answer is that you're presuming a "label" ought to be granted on the basis of the 1% of rounds played by touring professionals, 140 of the best 300 players in the world. For the other 99% and as pertains Riviera's greatness as an architectural venue, the "label" of Par 5 makes traditional sense.
The bigger reason for me, with regards to this "incongruity" you sense, is that it is yet another place where the individual hole par has become anachronistic, and is dampening potentially refreshing architectural answer to what the paradigms of good sport are. If #s 1 & 2 HAD NO "Par," we could just let the field (pro or am) sort it out themselves...we all know what we want, and what we are capable of at the end of the day and we know an excellent standard of play is a 72 (for the pros, lower)... I think we can sort it out as to what a good, plain, or poor score is on this 503 hole as well as that 103 yard hole... and a 303 yard hole (like #10) without one of three "par" numbers (3, 4 & 5) to tell or direct us to do. Especially true when 90% of the 99% are playing matches, and not medal/stroke competitions (not that this matters so much to the overall thesis)...
cheers
vk