5. Experience - despite the recommendations and good reviews, each project is individual and each object has its own characteristics. Therefore, when there is no way to avoid pitfalls, you need to soften their passage as much as possible and nothing but experience will help here.
6. Deadlines - they play a crucial role, especially when it is not about a single element of work, but about a long process that involves dozens of links such as: a customer with financing, a designer with ready-made drawings, a team of builders with specialists available at the right time, suppliers of building and finishing materials, logistics chains for the delivery of everything ordered to the site, etc.
7. Cost is the most sensitive topic. The spread of prices on the market is quite large and many customers who think in terms of "all designers are the same" do not understand why prices for work vary significantly. It seems to me that every professional deserves the value of his services, which he voices. You just need to understand that the ability to solve complex problems in the shortest possible time is the result of many years of work, training and experience, and it cannot be cheap.
8. Quality assurance is what every customer wants, regardless of the money they paid. And if we are talking about a product, then the manufacturer usually fixes faults during the warranty period and a single item can be either repaired or replaced with a new one. But this is very difficult, and sometimes impossible, to do with a design project, since it is integrated into the workflow and any changes can only occur due to the work already done by different specialists, but then a fair question arises: "Who will pay for this?" Agree, the responsibility of the designer is much higher than the sofa manufacturing factories. Therefore, when a specialist puts his signature under the adopted technical solution, he guarantees the quality with his own name. And if this is not an "experimenter at the expense of the customer", he will value his reputation and take the most responsible approach to work.