How compression of project life cycle effect project management?

At the most basic level the triangle of compromise says a balance has to be acheived between time (time available), cost (allocated funds) and quality (expected performance). If you reduce time, you can potentially increase cost and reduce quality. I have seen numerous examples where throwing addditional resources at projects can create even more problems and further delays. Shortcutting the requirements phase can lead to incomplete or unclear objectives which make it difficult to close down projects. Going from one project phase to another before you have completed the last one, can lead to some big problems in effective management and control. Running phases in parallel can also be a disaster and lead to huge financial over-runs and having to repeat unsatifactory completed work again. Not having an idea of what you should be buying when, can lead to your buying the wrong quantities and either not having enough or too much. It all leads to a breakdown of planning, control and management that causes huge stresses within the project and team, that can go on and have other undesirable consequences (e.g. people leave the team/company, people go off sick, stress levels go up and team morale and performance are affected, people get fired, risks just increasing, stakeholders loose trust, executives get involved to attempt to fix things, there is a huge increase in reporting frequencies and progress meetings, and Customers just walk away and don't come back). Plans are there to be followed, so short-cutting them without good valid reasons and understanding the consequences can significantly reduce the potential for successful project delivery and make it all harder for those involved to do their jobs.