However, zooming out, it's the incentive system that's completely broken: there is no skin in the game. Consulting firms are too detached from the consequences of their advice. Nassim Nicholas Taleb wrote a nice book about this phenomenon: https://en.wikipedia.org/wiki/Skin_in_the_Game_(book)
You get to recommend a better approach to an industry or technology and then go off and do it all while having equity in the company.
So if you oversaw the build-out of a system and everything went smoothly, good, but nothing to talk about during promotions.
On the other hand, if there were difficult issues faced and you fire-fought, sent out late emails with decisions to clients, came up with memos documenting tricky situations, awesome! Promotion material!
Of course, sharp consultants figured this out and the sharpest ones looked the other way when design documents had landmines -- just so they had known manageable issues to "manage" and "save the day" with.
Bad incentives, bad outcomes.
Take a big construction project. In the like of the Berlin airport. What do you think is more profitable for the consulting companies :
a) A well thought project, done in budget and in time. Where the consulting company gets the whole contract + all the bonuses associated with it.
b) A poorly managed project, that gets refinanced multiple times and that ends up being pushed back decades.
It's actually B. Consulting companies love long projects, because this allows them to place consultant for extended periods of time. And any consultant working for a client is a profitable consultant event without bonuses. Consulting companies hate projects that end up shorter than expected, because any bonus they might get from that project ends up being spent on consultant that are waiting for their next assignment.
The main KPI of any consulting company is "the %age of time you consultant are spending 'on assignment' vs 'on the bench'". And long projects where consultant are busy for years are the best way to bring that KPI to 100%, even when the underlying project is a complete mess. The only thing they get from shorter and better managed projects is a better image, which is easier and less expensive to get using marketing technique and PR.