I worked at a startup that started doing that, the company was only around 250 people at the time, but the VP of IT was hired from a fortune 100 company, and he

I worked at a startup that started doing that, the company was only around 250 people at the time, but the VP of IT was hired from a fortune 100 company, and he instituted the catalog approach of only 2 supported laptop configs (13" or 15"), and one desktop. When I left the company, the engineering director was working out how to let his team go rogue - basically handling all of their own IT support, the only caveat being that they had to install IT's intrusion detection software, but aside from that, an engineer would be able to buy any machine within a certain budget.