Perhaps big companies are around long enough for people (talented or not) to grow older until their priorities have changed enough to no longer fit within the company.
Unless you're in quite a large amount of control of a company's direction, it's likely after enough time (if you're talented) you'll want to move on to working on something that is outside the scope of that company's focus.
Unless you're in quite a large amount of control of a company's direction, it's likely after enough time (if you're talented) you'll want to move on to working on something that is outside the scope of that company's focus.