I hope, TTT, that you can appreciate that there is a difference between criticising the application of a policy and criticising the principles behind it. The two main ideas behind Universal Credit are that (a) the benefits system as it stood before was too complicated (although this is debatable), and (b) no-one who is working should be worse off than if they were instead on benefits (and vice versa).
I say that the first is debatable, because Universal Credit is really just a rehash of the old Supplementary Benefit, and *that* was abandoned in 1988 because, among other things, it was no longer suited to the real needs of the people it was meant to support. Or, in other words, the growth in the complexity of the benefits system is as much as anything else a reflection of how complex life is. So trying to simplify things again risks making them *too* simple, and so no longer as much of a help as they could be(*)
But it's hard to argue the second point, and I think everyone would agree that being in work should be better-paid than not being.
So it's not a WSS thing to criticise Universal Credit, because the principles are sound and almost universally accepted. But the way it's been implemented has not been. The situation hasn't been helped by, for example, trying to rush the development of UC through; or because it incorporates benefits that were previously within the remit of Local Councils (Housing Benefit) or HMRC (Tax Credits); at the same time that the DWP was trying to develop policy for universal Credit, meanwhile, it was also working on a new benefit, Employment and Support Allowance, that Labour introduced to replace the old Disability Living Allowance, and the double transition within just a few years has been an administrative nightmare.
All this, while the DWP has been subject to significant staffing cuts, and you can while imagine that the implementation has been incredibly difficult, if not disastrous to some families, and the amount of challenges to benefit decisions for UC has been huge, far more I believe than would be expected. Oh, and IDS was a prick, according to those who directly worked with him, apparently incapable of listening to official advice or respecting legal opinion. And he wasn't the only Minister at the DWP to be so incapable of understanding how the system is meant to work.
But rant over. I am not sure if Universal Credit should be scrapped, but certainly it deserves a good deal of attention and effort given to making sure that it is ready, more so than it's received so far from ministers. The roll-out at this point is almost certainly premature and will just lead to misery for many of those it is meant to help.
(*) Although as a counter to this idea that too simple is bad, you can also go down the Universal Basic Income route, and ensure that literally everyone gets at least so much money a year regardless of circumstances.