(long post, but I am agreeing with you)
It appears from the photos and other feedback that each unit shipped is a one week box. Order two months? Get eight boxes. It makes logistics much easier if step one is “pack each box the same” (ignore vegans for now no offense). Next step is “print X shipping labels, put one per box” and step 3 is "throw boxes with shipping labels onto the loading dock for the FedEx semi (lorry for you across the pond) to pick up.
Having spent six years in the USAF working on maintenance, inventory, and logistical computer systems, I have a pretty good idea that something as linguistically simple as “ship some boxes” is ridiculously difficult. To this day I cannot tell you exactly how difficult, I chose the “software engineer” career and not logistics, but it makes pretty good sense to me that “everything is the same” is easier than “everything is different” when packing and shipping. Amazon have spent years perfecting “every box is different” to include robots and advanced inventory systems. Rosa Labs are still relatively new to this idea, hence the shipping delays and desires not to overcomplicate the process. I cannot blame them, I would do the same thing given my background.
It would be great to have a sampler option with two or three bags in it. Sell it at cost or even at a loss, but limit it to avoid exploitation. But I would not risk messing up the current ramp-up and logistical lessons learned to branch out too early.