Not for me
I keep my Oyster card (and mainline rail ticket) in a separate holder, easy to get out for the barriers. If it's lost or stolen both can be replaced with a small amount of hassle.
My credit cards and debit cards live in my wallet, kept somewhere deliberately hard to get at because they are more valuable to me and more of a pain if lost or stolen. I do not want to be riffling through my wallet at every ticket gate (as I can only present one card). That feels less secure, and it will slow me (and those behind me) down.
Nor do I want to be waving my phone around at the barrier, for the same reasons.
So I think I'll just thank TfL for this and carry on as I am.