[throwawayqqq11]

> Pairing senior and junior devs works. But not because the junior is an idiot, but because they have stuff to learn.

I agree so much. The "dead sea effect" or whatever is just a lack of knowledge transfer. This problem remains over time too, eg look at the use of Cobol in the banking sector. Newer talents dont tend to learn old stuff. So what else is left for management to do in the long term than document really good and train newbies. If you think "migration", consider the timing, when the lack of knowledge already becomes pressing.