I worked for BMS for many years. In the early days, it was a company with a very diverse portfolio and some really fun, smart, and dynamic people. The big change, albeit somewhat slow, is when the company (and I think, sadly, most companies fall into this situation) changed from letting scientists and sales/marketing be overrun by attorneys/HR. Throw in ZS associates, robotic recital of messaging (dictated by the attorneys), so many different sales "models" (always with exclamation marks: ADVANCE!!! ENGAGE!!! PUKE!!!!) and hiring too many reps/MSL/etc. It became ALL about "checking the box" but it wasn't always that way, and those days are long gone and will never return.
I appreciate the benefits and financial rewards from my years there, don't get me wrong. But I don't miss it. At all.