Naturally I cannot speak for geneven, but my take on their situation is as follows:
They are used to the powder version, possibly even preferring it, so it becoming unavailable is inconvenient anyway.
Due to RL miscalculating remaining stock size during the first backorder (they initially said subscribers would still be able to get their subscriptions sent to them, and then changed this), geneven was unable to resume their subscription, so had to go without Soylent (or pay a much higher price) during that time period.
The powder version they are used to once again has become unavailable, which is another inconvenience.
And finally due to the original miscalculation during the first backorder by RL, despite being a very regular customer who I would speculate purchases more than the vast majority of Soylent users, geneven has been offered less discounted 2.0 than they should have been had RL not made errors. To add insult to injury, the email received was somewhat dismissive.
Now of course, you can take your viewpoint and say they should just view the discount as applying to all 2.0, just at a lower rate, but the point is, why should they have to? They may prefer the powder to 2.0 so this is already an inconvenience, and they are also receiving less of a discount for each box than other subscribers, despite being a very active customer.
I think it’s fairly reasonable to take issue with this service, especially given how much geneven has defended RL in the past. At times, I have been overly critical about nutrition and other factors, and geneven has often defended RL against them. For such a loyal customer, it is easy to understand the frustration of arguably being treated worse than other subscribers due to an error on RL’s end.