Waaaaaaaaay too many assumptions, Vger. As Spock said in COTEOF, "We're not that sure of our facts."
It is generally accepted at this point that DISC has not been a creative success. There are some people who liked it - and I'm happy for them - but it had a huge amount of problems. Some argue that it was a financial success, while strangely failing to make room for the possibility that people watched the whole season, like me, hoping it would get better, and also failing to account for the fact that CBS is almost certainly basing any appraisal of DISC's financial success on the number of All-Access subscriptions ("AAS") it enlisted. CBS has no way of knowing, however, how many people signed up for an AAS, but thought DISC was a trainwreck. Like me.
The clearest evidence that DISC is not a success is that it has been the subject of more BTS drama than most series get in their lifetimes. That cannot indicate that all is well and that everything is going swimmingly, although people here confusingly continue to argue just that. Moreover, your premise assumes that Kurtzman was intimately involved in the "dumpster fire," when in fact all evidence is to the contrary. Every piece of data we have suggests that OTHER people came in to run with whatever broad ideas Kurtzman had - that was his brief with regard to DISC - and those people are now gone. So CBS has turned back to Kurtzman, probably because he came up with what CBS views as a good proposal for rescuing Discovery, and because CBS thinks of him as a stabilizing figure and doesn't want to start all over. Instead, they're going to make sure that Kurtzman is the one in charge, for better or worse, and fire all of the Harberts and Bergs that have botched things so far.
You may disagree with this interpretation of facts, but there's absolutely nothing implausible about it. Your version, respectfully, acts like Discovery is a big success because Kurtzman is still around, ignoring the likelihood that Kurtzman didn't have anything to do with Discovery and all of its problems. Your version also ignores the strong possibility that if Discovery were really that great or really doing that well, CBS would play it out and let it have the spotlight instead of announcing something like five other series right after sacking Discovery's EPs.
CBS is a business and Discovery is a product. No business is going to throw millions of dollars behind a failing product or brand. If a product doesn't make money it gets discontinued. That is how businesses work. Take the retail industry for example. When a retail business wants to open in a new country or state, they'll do their research and market analysis and open a flagship store and see how it does. If the store is successful they will then open additional locations. I've seen what happens first hand to retail businesses that open additional stores if their flagship is failing, it loses the business further money and the company generally has to completely pull out of the region and cut their losses.
There is absolutely no way that CBS would ignore best business practice and go ahead with an expansion of the star trek brand if their flagship product was considered a failure. Discovery costs $8 million an episode, you honestly think shareholders would be ok with that type of money being thrown at five additional projects? It makes absolutely no logical sense.