What breaks first
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The labor, first
Washing and trimming are per-cucumber and they do not get faster with a bigger canner. Doubling output doubles that work exactly, which is why a maker who buys processing capacity to grow finds the bench is still the constraint and the new equipment is waiting. The honest first question about scaling is who is doing the trimming.
Then the surfaces
If you ferment, every vessel is a surface to clear and a weight to check for three to six weeks. That is attention, not space, and it does not batch: ten crocks is ten checks, and they do not wait for a convenient afternoon. Most makers hit this before they hit any physical limit, and the usual symptom is a soft batch in the week everything else was urgent.
Then the money
The whole year is bought in a few weeks and sold over months. That shape gets worse as you grow, because the outflow scales with ambition while the inflow still arrives on its own schedule. A business with a good margin can run out of cash in September, and growing is the thing most likely to cause it.
What this means for a growth plan
Add the constraint that is actually binding rather than the one that is easiest to buy. Usually that is hands during the window and a room you can hold at temperature, not a larger canner. And it argues for growing in steps that fit a season, because every increment has to survive a picking window before you find out whether it worked.