Well, I think those comments about Shoreacres may need to be clarified.
The work that was done there also coincided with the arrival of a new green keeper and the playing conditions have changed substantially over the past 5 years.
Tee to green, it is not a hard course at all especially now that the fairways are WIDER and the course has ~1000 fewer trees.
But, just like Chicago GC, the fun starts when you get near the green complexes.
I agree that SA was pretty benign as it was relatively short, in great shape with wonderful greens that rolled well @ ~ 10-11.
NOW that is a different story entirely. FWs are fast/firm/down/brown...etc.
PLUS, several back tees have been added on par 4s (2, 5, 7, 10, 16) making it a real test with holes that are now 475-495! (Except 2)
Combine that with the masterful integration of bunkers and greens there and that the speed is now 12+ and you have a course that has reintroduced the ground game and made the player think on every shot.
Shoreacres may be the exception, not the rule, when it comes to restorations.
Otherwise, I would contend that, post restoration, most courses are easier:
1. Wider FWs
2. Larger greens
3. Brand new bunker sand
4. Less trees and obstacles
5. In some cases, new perfect greens and new perfect FW grasses
6. Better drainage