it's more important for the Hive ecosystem to grow. It generates more value.
This.
Also, USD inflation makes the HBD peg easier to maintain. The problem is that it's becoming harder to maintain because the Hive ecosystem isn't growing, it's shrinking. For the ecosystem to grow the users that are becoming discouraged, because they split ~10% of the rewards and the ~36 whales capture the rest, need to gain more of the pie - and more of the pie yet needs to be available to new onboards that extant creators will attract when their increasing attainment of rewards causes them to make posts expressing their happiness with posting on Hive for rewards.
"I don't see the point of HBD..."
When the platform arose in 2016, crypto was a new kind of money, and having a stablecoin pegged to the dollar enabled folks skeptical of crypto to have more confidence in HBD. It also facilitated using HBD in commerce, because vendors also had the same problem. Later the fact that whales had to curate posts and gain curation rewards to gain ROI on their stake demonstrably caused derangement of curation, causing trending to be filled with garbage posts whose only purpose was as a common target for whales to upvote to maximize their curation rewards as quickly as possible.
High interest savings accounts would enable whales to gain reliable, predictable ROI from saving their stake, eliminating the need for curation rewards, and eliminating curation rewards would restore curation by subjective valuation of it's quality, rather than because upvoting the most popular post enabled the highest curation rewards to whales hunting ROI.
However, curation rewards were never reduced. Rather they increased. I think authors now get ~10% of the rewards from the pool, while curators get ~60% (I don't recall the relative % specifically, but Holozor knows how to extract that data he showed me recently). Greed is killing Hive.
Edit:
"...they will have to enter the crypto world."
Yes, but CBDC's will just enslave them, not have any potential for enabling prosperity. We will own nothing, and be happy - or else. Remember?
Doesn't the author and the curator get the same treatment?
While the rewards on a post are split 50/50 per the code, there are various mechanisms, such as DV's, and curators targeting higher valued posts, the reduced author rewards for comments introduced in HF27, and now the change in HF28 that more rapidly bleeds VP enabling whales to more efficiently maximize curation rewards while discouraging engagement by bleeding minnows dry of VP when upvoting comments, as has recently happened to me and left me clawing and scrabbling to rebuild my VP for more than a week now. On top of these overt mechanisms, circle jerks, self votes, botnets, and other rewards pool rapine continue to operate more covertly to focus the rewards pool on whale accounts and increasingly exclude minnows and lesser staked accounts.
Cumulatively these mechanisms contribute to whales extracting >90% of rewards from the pool, curation rewards being ~60% of outflow from the rewards pool, and author rewards ~10%. 10% of the pool goes to the DHF where the largest outflows of the DHF are operations whales almost exclusively benefit from, such as the HBD stabilization program, Valueplan, and etc. For more explicit understanding of how whales almost exclusively extract rewards for HBD stabilization, please look at HBD-funder comments, which are employed to apply author rewards to the HBD stabilization fund, but actually mostly are paid out to the voters on those comments, which are published 20 at a time or so, as curation rewards. 10% of the pool goes to witnesses, and the best rewarded consensus witnesses are mostly whales, and have been consensus witnesses almost continuously since 2016.
Edit: there are details of curation/author split that require deep investigation but also contribute to curation rewards dominating rewards pool outflows, such as that upvotes on creation after 1/2 hour (IIRC) provide authors a percentage of the curation rewards in addition to author rewards, and I have little familiarity with more esoteric mechanisms that matter a great deal to substantial stakes seeking to maximize ROI.