You are responding to a tender, or to a request from an operator. The file calls for hatches, a caged ladder, fall protection bars or a guard-rail. And when it calls for stainless steel, you would sometimes like to offer composite as a variant.
The submission date is set. Until then, you take the measurements, you price the job, and you need the lead time and the data sheet. If you win the job, another date comes along: the day on site. Your team is booked for that day. The equipment has to be there, and it has to go together.
Then your team leaves. And someone climbs down.
They lift the cover, raise the bars, take the ladder. At that moment, the submission date is long past. What counts is what you installed.