Hi @crib bar
Removing the admins rights to the ACL shouldn't impact the operation of the file share from a user perspective, as along a the users are assign specific permissions to the folder and files. However, it will impact the ability of the admins to support the the users if they have issues and increase the time it will take to identify and resolve issues. Usually to address this type of risk question\concerns, visibility is easy way to address this concern. By changing the delegation model and enabling auditing you can limit access to the folder and report when access is granted. Enabling auditing on AD changes and on the server, you can record when an admin increased their rights to access the folder. Obviously this assuming you have a SIEM capturing the event logs and a delegation model in place to support this configuration.
Gary.