I am a golf slut and enjoy pretty much every course I play. Having said that ... it eludes me why you would commit to building an entirely new hole on a top 10 course in the world (and my personal favorite) that doesn't significantly improve what was there before. Makes no sense to me.
The club has over 1k members, not a small number who have been there for decades through numerous changes. The #7 project was considered over many years and was only undertaken under the guidance of experts in design and construction with a large majority endorsement of the members. It doesn't make sense to me that it makes no sense to you.
I was asked by a member out of the blue (a stranger to me who started a conversation in the locker room) last year whether I thought that the RD's Championship course was truly a world top 4. Knowing a bit about ratings and members, I skirted the issue with the same answer I offered a tourist at Trump Aberdeen when asked about the veracity of the plaque by the clubhouse (paraphrasing- "some believe that T-A is the finest links in ......), that it is certainly in the conversation.
My inclination is typically that if something works, don't mess with it. At the same time, change is constant; if you are not getting better, you're declining. The vast majority of the world's greatest courses have undergone many changes, some small, some like Augusta National, Pinehurst, Pebble Beach rather substantial.
To address Jon's earlier question and rather ludicrous prediction (adding 20 minutes to the round), golf is a highly visual game- why does a pond between the ball and the green on a 100 yard shot cause many golfers so much grief?. Why does #7 at Pebble Beach or #17 at Sawgrass require so much additional care?
The new #7 uses superior land by virtue of bringing the cliff into play in addition to the better visuals. It is probably more windswept, and though I have not personally verified the infinity green aspect, the trouble around the green on the aerial appears closer than the old. Depending on whether the club opts to mark the gorse right of the fairway as a penalty area as allowed by the rules, it could actually save time.
As to unduly delaying play, the club and its caddies do a good job of moving players along. There are any number of picture opportunities throughout the course, and like CPC's #16 where some players hit balls until they get one on the course, this shouldn't be a problem at the new #7. I suspect that even during visitor times, most 4-ball rounds will be completed in under 4:30.