This is a vendor specific case.
Operators in general have their own algo algorithms that are used to tackle capacity issues. For instance, Huawei offers a dynamic UL dimensioning algorithm, hence one hardly experience any UL capacity related problems (excluding the cases where your physical limit, i.e. number of PRBs etc, is not sufficient), whereas NSN requires you to manually dimension UL PUCCH/RACH bands based on your capacity requirements.