[NumberCruncher]

>> Well functioning teams in which people share responsibilities are not rare.

Setting up your team structure with the idea that it "might work out" because "it is not rare that it works out" is pure gambling. What is the definition of not rare anyhow? Probability > 0.02?

>> When a team is not functioning well, assigning a tech lead can potentially make it worse.

If you build your house with the idea of "planning for the best" because "it is not rare that it works out", calling a good architect after you realised that your house is collapsing "potantially makes it worse". That is because the architect potentially recommends you blowing the whole thing up and starting from scratch again.