>You list 40 positions on your resume?
On one version. I also have a standard one-pager, a 6-pager, and a 12-pager resume for those HR/recruiters looking for depth + breadth experience. Per one 'job board', I actually get about 30% more contracts from my 12-pager than the other two versions combined: keywords and keyword density I am sure.
I have a 2-pager "Contracts" list that just lists companies, dates, position, and a 1-2 sentence blurb about each...and this is just for SharePoint/MS Project/O365 contracts since 2008...not even my whole career, nor oddball stuff [Adobe LiveCycle Rights Management Config: WTF?, Clarity PM Development, custom map software, etc.], nor short <30 day issues if the client wasn't "notable".
I have seen other Consultants with significantly more experience than me that have multiple pages just for publications, books, courses taught, etc. and/or patents on their resume. Due to the enterprise market that SharePoint once exclusively targeted, most of my clients are large Fortune 500/1000 companies and listing the numerous ones I have worked with has not been a noticeable, or even real, detriment.
My line of thought: "Would $hiringManager hire someone that only worked at 2 or 3 places [no gaps though!] to solve this problem, or would $hiringManager hire the consultant that has blasted problems away at over 40 notable companies, wrote/taught courses on x, wrote the book on x, etc." My gaps are [invisibly: not listed] filled with 'smaller' work/contracts, that if listed, would multiply my resume's page count by some factor of ridiculous and, to some uninitiated, dilute my value. First world problems.
I do see that Architect/Administrator work for on-premise SharePoint/Project is declining while more SMBs are buying into Office 365/SharePoint Online/Project Online. Yet, just today, no less than 3 contracts/RFQs came in for on-prem SP2013 to SP2016 migrations. One contract I cannot take because it is in NYC and for a City government migration (not top fees and typically difficult to work with, and too far away); a largish Seattle company (~7B revenue FY15) that is qualified and has an interesting business and requirements; and a consulting company in Hollywood that needs someone 'yesterday' to fix/correct workflows in their large studio client's workflow manager farm prior to the SP2016 migration.
I digressed.