Star Trek: Discovery made a mistake with its season one version of the Klingons. That's no big secret. Then the writers/producers fixed it and moved on. No television series gets everything right. There are still viewers very unhappy at the way Lost ended. But there are ups and down in the industry, and we, as fans, can't always get what we want. We can make our voices heard, but that doesn't mean the producers will change their minds.
Discovery didn't earn the love of all Star Trek fans, but it did have its devoted followers. And most of those same followers are also fans of the Trek series that came before. We watched Discovery, seeing it as a different form of Star Trek, not as a series that was trying to oust what was before like Giant Freakin' Robot's Joshua Tyler wrote. Changes were made, and new things were introduced, like the spore drive which introduced the mycelial network. Not everyone liked these differences, but the series continued for five seasons, which says it had viewers to keep it going.
I've talked with many fans over the years, and there are plenty that are only devoted to The Original Series while some will only watch The Next Generation or one of the other series. Some fans just started watching Star Trek when Discovery premiered and that made them go back to watch all of the pre-Kurtzman era shows which was a win for Paramount and the franchise.
Discovery didn't get everything right, but it didn't get everything wrong, either. And I've said this before. Without Discovery, we wouldn't have Strange New Worlds. So, clearly, it did something very well. The entire second season resulted in a spin-off that gets renewed before a new season has even aired.
We're all passionate Star Trek fans, and I get that we like what we like. Opinions will continue to be shared, and fans will defend their favorites to the end while taking aim at other series that, in their opinion, didn't measure up. But it would be surprising if any Trek series was created for the sole purpose of erasing franchise history.