Sadly, this is the story of nearly every React project I've reluctantly inherited. In my experience, it's because React is not opinionated like its peers Vue and Svelte. So, a bunch of devs will use something for state management and and another team will use something else completely. Eventually both teams leave after making a mess. But, if you look at the graphs and numbers that MBAs chase, they will all look like everyone was productive until the very last minute. The ultimate casualty is unfortunately the user. Even Facebook hasn't figured out React across their properties. Just use Instagram / Facebook on the web. Bunch of spinners to load a static list of items in a drop down menu. Not even joking, click on the bhamburger menu on Instagram web. It makes a dozen requests, shows you a loading skeleton and takes 5 seconds before you can see a finite list of menu items. Ironically Facebook was super popular in the 2014s because they didnt have much React based BS going on. Everything was just good old hyperlinks.

If the creators of React haven't figured it out, what makes you think you can?