It was stated in a Q&A that the feature required a rework of the multiplayer code.
It make sense since they might not have had the time to plan this kind of thing early on when they inherited the project and started getting things up to par.
FS24 has a lot of code re-write so i feel more confident in the development of the feature this time around. Given the feature needs a solid network architecture, sync of a multitude of variables and many unique edges cases to keep simulations in sync/parallel, the coding challenges are pretty large and require that amount of time.
Asobo would have had the opportunity to get this planned out early enough in the FS24 development to have a go at it, and I hope we will get some news from them soon, even if its just a timeline or a feature discovery series at a future date. Its a difficult system to engineer and Asobo often dont get enough praise for the variety and complexity of issues they have to work with, while in a fast pace software development environment.