My workplace which now uses scaled agile used to be waterfall. We have an enormous system to take care of and there's loads of specialised knowledge, so we were pretty well siloed

So obviously when the sales people sold agile to the organisation they also sold the idea that a programmer is a programmer, designer a designer, tester a tester; no need for specialists, so in 2015 they spun up 50-odd agile teams in about six trains, one for each major system (where the used to be seven silos in one of those systems) grabbed one senior designer and programmer from each major project to put in an "expert" team

And told the rest of us we were working on the whole of our giant system. Where we had trouble understanding how part of it worked, we could talk to one of the experts

Now nine years later those experts have mostly retired, we have lost so much institutional knowledge and if someone runs into a wall you need to hope that someone wrote a knowledge transfer document or a wiki for that bit of the system