According to Wikipedia: "Rome wasn't built in a day" is an adage attesting to the need for time to create great things. It is the usual English translation of a medieval French phrase, Rome ne fu[t] pas faite toute en un jour, from the collection Li Proverbe au Vilain, published around 1190. The modern French form is «Rome ne s'est pas faite en un jour».
For many years this adage was too the case for website design, indeed when building you a website your webdesigner will be invariably spinning many plates at once. The customer will often think in terms of just what's on "that page" at "that time" whereas your webdesigner will be thinking "how will this work with the rest of the site?", "how will this look on a mobile device?", "will this page load fast enough?". The symbiosis between webdesigner and client when building a website would often fall in to a plethora of miscommunication via email and phone due to this common misalignment of goals and objectives.
It seems so obvious to me now, after building websites in a single day since 2018, that clients simply prefer it that way. The proverbial "left-a-bit, right-a-bit" is so indicative to web designer and client working together as a team, web designers know websites and clients know their businesses.
You may remember the story in the Guardian from early 2019 where the “startup” company hired to operate extra ferries as part of no-deal Brexit planning had no ships and furthermore had terms and conditions from a fast food delivery firm on their website (https://www.theguardian.com/..), this was obviously a case of temporary content being copy and pasted on to that page and subsequently being overlooked during proof reading. The scary thing is that this happens all the time!
Now I'm not saying you should watch your webdesigner like a hawk just in case they make a similar mistake, far from it, trust in their experience, it's what they do, I'm just advocating a partnership between web designer and client.
So we've all now learnt the phrase "Rome ne fu[t] pas faite toute en un jour" was the medieval French phrase for "Rome wasn't built in a day" and that building a website with your website designer is so much more productive than when you both go it alone, and in summary less confusion and miscommunication leads to more speed and thus the DayBuild® Website becomes just the obvious way to build a website.