if what you're saying is true and not exaggerated/spin, then they (core) has truly gone mad.
well segwit only fixes things if everyone is disarmed from doing quadratics/malle which is only really achieved by moving to segwit keys. (the activation is more about getting the topography of the tier network inplace when people set up thier node
...
mimble works by having a mimble manager with the key to a multisig to use funds without the owner having to be actively online.
...
the spin is only.. if these get activated and if they are used by the managers for negative purposes..
there is no spin about the functions abilities. just who and how it could be used by the wrong people incharge
sorry if im never the utopian dreamer and ass kisser. but i look for flaws to wake people up to risks.
P.S core went mad ages ago. for many many reasons