Reserve requirements are a constraint on deposit creation (inflation), but not for all banks.
Most banks do worry about reserve requirements too much, because if they see a good investment opportunity, they will go for it and borrow the base money they need from other banks. If the base money is scarce, this will drive up inter-bank lending and the central bank will load more to the banking system to make sure that such a lending rate does not change. So in a sense, the tail wags the dog.
So say in an economy of 1000 deposits constrained by 100 reserves (given the reserve requirement), then the banking system can get around such a constraint...by increasing reserves in the aggregate! It simply borrows from other banks more and very indirectly, but very powerfully, the central bank will facilitate this. So the banking system could go from 1000 deposits to 100 reserves...to 2000 deposits to 200 reserves. Same reserve ratio. Same target bank rate.
This is why other matter are used to regulate bank lending (like capital requirements).
A proper strategy to limit bank lending would consist of a combination of reserve ratio changes, capital requirement changes and an increase in the central banks target of interbank lending.