Write the thesis to survive the attention budget it will actually get, which is measured and short.
DocSend's study of seed decks put average investor review time at 3 minutes 44 seconds for the whole deck. Papermark's analysis of ~3,000 decks found the first page gets more than twice the time of any subsequent page, with the rest averaging around 15 seconds each — and only 58% of decks are read to the final slide. Nearly half of readers stop before the end.
So the thesis is not a section of a document that will be read carefully. It is the thing that has to work in the first fifteen seconds, twice, and it has to survive a reader who will never reach your appendix.
What it must contain to be a thesis at all rather than positioning copy — a claim that could be false:
- What changed. Something is different now that was not three years ago: a cost curve, a regulation, a behaviour, a capability. If nothing changed, the honest question is why this does not already exist.
- What that makes possible — the specific thing previously impossible or uneconomic.
- Why you. Not credentials; an unfair position — something you can see, reach or do that the people who would otherwise win cannot.
The test: if a reasonable person cannot state what would falsify it, you have written a slogan. Then leave it alone and let the objection notes erode it — a thesis that survives dozens of meetings unchanged is either very good or was never seriously tested.