There is no 5* scarlet witch available, so a r5 4* SW will be the strongest version of her available for a very long time, so its worth the investment.
I think so. Mine has been very useful with her ability to nullify buffs when she crits. I use it against a lot of regen, power gain, armor up champs. And she can also proc her own buffs like power steal, power block, regen, cruelty, furies, heal block, and maybe more but I can't remember.
She is arguably the best 4* champ. Whether or not you subscribe to that she is a top 4* and not available as a 5*. Sad that you didn't get to play her at her OP best but if you are going to rank a 4* rank SW.
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She's still one of the best 4*s I think.