The real scandal is that the threshold has not increased with inflation, which is a clear movement of goal posts.
There was also a couple of years of high inflation that was completely out of step with anything seen since the 1970s and totally at odds with government policy.
But a lot of people are saying things that are clearly untrue like a PP who claims someone with a Plan 2 loan earning £30k is paying £200 pm, because they're absolutely not, its more like a tenth of that. So a lot of the claims need to be taken with a pinch of salt.
It was always clear that mid to high but not very high earners (eg if they earned around £50-80k pa averaged across their career) would pay a lot back on Plan 2, because their monthly payments would be significant but not enough to clear the loan.
Lower earners don't need to worry about the interest because many don't even pay off the loan let alone any interest. If you pay £50 a month, that's £600 per year, £6000 in a decade or £18000 across the whole 30 year period. So the interest could be a million pounds a year and you'd not pay a penny.
Very high earners pay a lot each month but less interest than the mid earners as they pay the loan down faster.
So if they recalculated the loans with the payment thresholds uprated with inflation each year as was originally implied, then the scandal would mostly go away and any remaining complaints are likely due to people not thinking through very basic maths.