While the numbers end up the same, the calculations have different denominators, and that turns out to be pretty important.
The total Steem in the pool is determined based on the total number of Steem in existence, while the distribution of the pool is determined based on the SP used to generate rshares.
Now that SBD is closer to normal that ratio is the primary factor determining things like the self-voting APR and the total profit available in a vote-selling transaction. It's a big deal.
I'm only going to say this one more time. The reward generated per SP will be exactly the same as before The number of rshares used to calculate payout will be lower, but the reward per rshare will be higher. The two differences will exactly cancel out.
By design, authors will receive (slightly) less of that reward and curators will receive (slightly) more. Neither you nor anyone else has yet come up with a coherent explanation why this is a bad thing.