I think both of you touch on a meaningful, but highly flawed, kernel of truth behind the traditional phase designations… universal assumption of what is “complete” in the design process part of project delivery.
I think all can agree what “complete” looks like for the actual construction (although many contractors will argue about their obligations at the very end so they can close out and finish getting paid). Extrapolating the phases of construction progress (some arbitrary system of 25-50-75-100, 30-60-90-100, or whatever percent breakdown) to track progress, and thus payment for the contractor, is evident by comparing a “zero state” to the “end state”. If 50% of what has been designed, documented, purchased, and installed is clearly visible (thus verifying claims by the GC and subs in their invoicing), the everyone should be able to have a common agreement/understanding of progress. However, one error that is commonly made, is that the “time” vector is a strict indicator of progress when every hates to admit the uncertainties (weather, labor, supply chain, calendar, pricing, cashflow, etc.) that will inevitably disrupt even the most well-meaning, conservative schedule.
But as @David_Stutzman pointed out, in a highly dynamic, reiterative, and decentralized process of design - from initial ideation through “finished” construction documentation - delimiting the design process into “percent complete” tied to some standard (which is often massaged for a firm’s or project’s purposed) phase is fraught with potential failures from the very beginning. I believe that even after hundreds of years and generations of practice, we are still no closer to an essential efficiency, and thus predictability, of the design process that enables consistent, repeatable results that adhere to any arbitrary standard devised. Besides the completion of content, time is yet again injected into the formula, thus ensuring all expectations are doomed to be disappointed.
Early in my career, I was always frustrated by the incongruities and inconsistencies of progress in the design and contract documentation on any number, types, and sizes of projects. Software, like CADD and then BIM, never really seemed to make an appreciable dent in solving the problem… many times even exacerbating it. When I pivoted to being part of AEC software development, I thought there might be an opportunity to help architects make things better… nope. And working in the standards world nearly exclusively for the last 10 years has proved nothing but the same… no meaningful, fundamental changes or progress.
At the same time, I saw how the legal profession had no such artifices… the client paid for time spent or risked losing legal representation and ability to “win” a legal dispute or properly construct contracts. But, then again, the concept of progress is different, isn’t it. There is a zero state and an end state, but just a lot of incremental work in-between. And in the medical world, progress is completely arbitrary and services are pay-as-delivered, sometimes even completely disconnected from an end state (sadly).
I guess we’ll never really find a meaningful answer/solution/standard as long as the design process and humans remain as messy as they are. Does this mean we’re just doomed to be inefficient in the process?