Exactly this, agree 100%. They are giving us more without actually giving you more and placing extra demand on the system. In addition they have acknowledged that some rides FP capacity will be sold out in advance. I think the always hold 3 FP option would have been difficult for them to implement especially if they remove tiers and allow park hopping for the extra FP's.
As far as SB strategy, seems like the only really good one at this point is to try and time your SB rides for the least popular FP return times. Unfortunately, not sure if we know those yet. You can guess, RD, parade times, right before closing etc. Ultimately if we had an app that would let you know how many FP slots are still available for a given ride at a given time, you would pick the time slot with the most FP still available to ride SB. Not sure Disney has any desire to offer that type of service but it would be nice for timing SB rides.
The big unknown in all of this is guest behavior. Don't think anybody even Disney is fully aware of how guests will use the new system yet and how they will prioritize FP times but they have a better picture than any of us I am sure. I expect one day when its all working and tuned, we will see much more consistent wait times across the board.