[mancerayder]

Seniors and leads aren't going to get a lot of depth in a short period time, either. Seniors and leads do a lot of non-deep work that, depending on their responsibilities, may involve "lead" activities that take away from deep-diving uninterrupted.

Also I don't think seniors and leads with short stints are to be trusted (from recent experience with such people).

[htkibar]

This really depends on the projects / companies people are involved with as well. Especially on the front-end, it is very common to take a project from start to post-launch support in a year, especially in a "non-tech" company.

Staying after that in a lot of these cases mean a lack of interesting projects, and also end up with stagnation. My experience may be a bit affected by freelancing though :)