> Anyone else notice this?

This is most big companies. As they grow in size, staff functions get compartmentalized. As their main product matures, the need to develop new things slows down, and daily life becomes more about knob-turning and optimizing what you have to extract more revenue. This means that, for example, the developers, PMs, designers eventually run out of things to do, so whatever they still got ends up growing in size and eventually taking most of their time, be that mentoring, committee work, random initiatives here and there etc.

Source: was dev turned PM in a previous life, managed to flee to greener pastures.