As someone intending to develop a new modern client, I think a sensible (and useful) suggestion would be to add something along the lines of "Legacy Considerations." This could be inserted either as an additional row in each of the 2.x tables as necessary, or as a new section 2.5. That way 0084 can be recommended for new deployments, while acknowledging that 0153 is still widely used and advisable if you want any kind of compatibility (but that the latter isn't a recommendation in its own right.)
More broadly, this would open a space to mention other XEPs that aren't suggested but are still needed in reality for compatibility (e.g. 0049?)
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