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I personally don't see an acceptable reason for it and will start removing witnesses that fail to update in a week or so.

Thank you. I've made the decission to notify and unvote all witnesses that run older versions until I at least get an answer from them.

In many cases of lower ranked witnesses (like myself), the update won't actually reflect until they get the next block (to signal back to the network).

I have updated to 0.19.1, but until I get my next block it won't reflect this unfortunately.