The whole point of the omni-context is that you are putting yourself in a space where you have to act in a way that is appropriate to all of those places.
I would say things in the Bar that I would not want the reverend, my grandmother or my children to hear - but in the uni-context I have to mediate my speech to what is appropriate to all of those audiences or risk judgement for it.
The uni-context discourages expression. It's like a dystopia where everything you say and do is recorded and can be recalled for judgement at any time. And yet people sign up for it.
Trying to maintain separate context, different identities across platforms is an attempt to fight against that and to limit the risk that something I say on one plaform is not going to destroy my social credit in every other platform where I participate.
It's a panopticon, where we self-censor because we fear unknown future reprisals. Did we really sign up for it? Or has Our (collective our) ability to reason and push back against it been curtailed by financial incentives to build it?
What we are really missing is the ability for expression to be subjective by default. When we participate in socially global contexts, everything we read and write must be coherent to the generalized expectations of the entire group of people who are participating in that context. Instead of your words being taken out of context, they are constantly assumed into the context, implying your own interpretation is objectively wrong. The meaning of every expression is decided and relevant, even when it shouldn't be.
Unless you are more after acknowledgement than sharing/helping others (and be on the receiving end sometimes), this is non-problem.