Mark, it’s a two-way street.
As an independent, I don’t force the structural consultant (or any consultant, for that matter) to use my masters, which are largely MASTERSPEC sections with a few modifications here and there, and some pre-editing.
I once had a potential client tell me I had to use their specification masters, which was okay, except that I added an additional fee to do so because I knew it would take me longer to edit their sections due to my unfamiliarity with them.
As for the firm not being able to incorporate their preferences and lessons learned, that is true. But, you also have to consider that an independent also has developed preferences and lessons learned. The key is communicating that information: architect-to-specifier and specifier-to-architect.
In the end, the project architect, project manager, or whoever has taken responsibility on the architect’s staff to review the specifications, MUST review the specifications–whether they’re prepared by an independent using the independent’s masters or the architect’s masters, or by the in-house specifier.
All I ask of consultants when preparing their respective sections is not to specify things that are the responsibility of the architect, coordinate requirements with other consultants (e.g. not having the civil, structural, and landscape consultants writting their own version of the “Earth Moving” section), to identify the correct section when referencing a section not prepared by themselves, and not to rewrite or modify the requirements of Division 01 in their sections.
I may cry out “why, oh why do they do this?” when I read consultant specs that begin every other paragraph with “Contractor shall..” (or, worse, “Mechanical/Electrical/Landscape/ Subcontractor shall…”); or include phrases such as “any and all” and “workmanlike manner”; or contain words like “hereinafter” and “aforementioned.” I force myself to look past these types of specification “indiscretions.” Otherwise, the project manual would never be ready by the deadline.