THE SHORT ANSWER
Because two jobs are hiding under one title, and the market is hiring for the harder one while equipping for the easier one. Christian & Timbers, reported by TechCrunch on July 30, 2026, counted about 17,000 forward deployed engineers in the US and about 2,000 who can deliver measurable ROI, with demand projected up 2,100% by year end. Chris Taylor of Ode with Anthropic drew the line: many FDEs can roll Claude Code out to a workforce, few can build a flagship AI feature. The second job needs four things the engineer does not carry in: a harness they can change on site without a redeploy, an eval the customer's cases can join, a handback path with a product owner on the other end, and a sales motion that sells scope. Give a competent engineer those and they deliver ROI. Take them away from one of the 2,000 and you get bespoke forks and a resignation. The shortage is real, and its cause is the product operating model around the seat.
The number that travels is 2,000. The number that matters is 15,000, because those are the engineers a leader can actually hire, and whether they deliver ROI is decided before they arrive.
An FDE is only as effective as the product lets them be on site. If a fix is a pull request and a release train, the customer waits and the engineer forks. If a fix is a context edit and an eval run, the customer sees it the same afternoon and the next customer inherits it. That difference is a product decision, and it is the whole shortage.
Part 2 of The FDE Transition makes the case in full and lists the four prerequisites. The handbook chapter on what has to change in the product before FDEs can work is the implementation guide.