If that happens, there is maybe light at the end of the tunnel: by getting the two groups to talk in responsible, non-blaming way can put you on the path to a solution long term.
If that doesn't happen, or it's non-obvious to incoming leaders, then it's likely a slow death as depicted in the sibling comment.
Yes, great tools, but they have shown they're not good problem solvers. Case in point, they decoupled the CMS and made it headless and the new headless frontend is an archaic management nightmare. They have to manually import pages every time there's a change via excel sheet, and it takes up to an hour to reflect new changes published from the CMS. Nobody who's been here for a while is happy because the new system absolutely sucks, and they're trying to pretend this is fine.
If I may suggest an easy read, look up Radical Candor by Kim Scott.
If "nobody who's been here a while" is ready to open their mind and embrace the new team members either, you are getting nowhere quick: hopefully this is not a battle, and you only come out a winner together.