What breaks first
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The roaster
It caps how much you can make and it carries the safety control, so it is the one place where capacity and compliance are the same purchase. A roaster with reliable, readable temperature control is worth more than one with more capacity and worse control.
The grinder
Domestic equipment does not survive production and the failure is gradual: output gets grittier for weeks before anything breaks. Plan for equipment rated for continuous running, and plan for its wear parts as a consumable rather than an event.
Changeover, which is the real ceiling
Every additional nut or seed in the range adds a full clean between runs, and on a product with a serious allergen profile that clean has to be thorough and recorded. Three products on one line can easily mean more time cleaning than producing, which is why makers consolidate their range as they grow rather than widening it.
Scheduling can buy some of it back
Running the same product in longer campaigns, and sequencing from the least allergenic to the most, reduces the number of full changeovers. That is a planning decision rather than an equipment purchase and it is usually the cheapest capacity available.
What does not break
Filling, labeling and boxing scale linearly and predictably. They take longer and nothing surprising happens, which is why they absorb attention that belongs on the three above.
Dedicated beats clean, when you can afford it
The moment a second line is affordable, a dedicated line for the most allergen-sensitive product is worth more than extra capacity on a shared one. It removes a cleaning operation, removes a label qualifier, and opens a market that a shared line cannot serve honestly.