This was me in 2018-2020 writing rants about OP.
I slowly moved away from OP and started reading series like JJK, ToG, Chainsaw man, Sakamoto Days and some others.
I have read all of what you wrote.
This reminded me of a smiliar story:
Candy-maker Willy Wonka hid five Golden Tickets amongst his famous "Wonka Bars". The finders of these special tickets would be given a full tour of his tightly guarded candy factory as well as a lifetime supply of chocolate. The contest set off a global craze, with everyone desperately seeking the tickets.
We, readers, will love to get the chocolates (ending of OP). But we have to find golden tickets, which will likely take half a century
Oda is not selling the manga, story, art, or anything else you can name. He is selling the "craze" that he initially created and it depends on sustaining the "desperstion" of readers/fans. He throws the candies here and there to please the fans, but not the golden tickets
Think of Oda as a business man, and it is his strategy. But I hope he does not inspire others to do the same, for obvious reasons.