Not to put too finer point on it - but have we considered that what other customers (potentially even most people) want is not the same as what we want? Given Spark and Vodafone have gone endless, and overseas telcos have gone the same way, the clear trend is to this model. To say they are not listening to their customers just because they've made a change that you didn't like isn't really fair.
I don't expect 2degrees to have contacted every customer and said "hey do you want A or B?". They will have done market research via focus groups and online surveys and potentially through direct voice of customer activities, and made an informed decision.
As we've said before on this forum (including about other telcos) - products and services and expectations change all the time, and not every change will suit every customer. They also can't keep grandfathered plans around forever in fairness.
(Note this is notwithstanding the fact that the new plans appear to have been marketed incorrectly in the app, and you would be right in saying it should have been clearer you would lose sharers)