In my experience in working as an R&D product development engineer in the medical device industry, I would say that projects do generally get pushed to get done quicker due to project deadlines but I do not feel that it generally impacts the success of the product. When working in the medical device industry project deadlines are often driven by the impact that the product will have when the product makes it to the market. The business strategies for companies usually forecast how well the product will do if it is able to make it to the market by a certain time (project deadlines). As far as making a successful product, this is usually defined by whether or not the product meets the desired need / request of the market that is demanding it. Defining the design inputs (market needs / requests) usually happens very early on in the project and in my opinion does not have a major impact to overall time that the project will take to be completed. As long as the design inputs where defined properly from the beginning the product should be successful if it is able to meet all of the intended design inputs. In the medical device there is a process which needs to be followed for product development cycle (Design Controls), which forces you verify that all of the design inputs are met. The speed at which the design control process is completed will not impact the successfulness of the product as long as the process is followed and done correctly.