>This makes a lot of sense for telco since it would drastically lower the cost of their deployment and the maintenance of the 5G network.

Actually no. Integrated solutions are cheaper to make at scale (for how much it's sold it's a different question) Also integration of multiple vendors into one working solutions has additional costs both for deployment and maintenance/support later (instead of 1 piece of equipment you have 5 boxes with 5 vendors pointing fingers at each other when something fails). Also more points of failure