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With Season 4 of Shadowlands going on now, Blizzard has released a new list of activities and rewards that will become difficult or even impossible to obtain once Dragonflight launches.
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As for many of these there is literally no reason to remove them. Just the same ol' same ol' trick to try get people come back before each new expac.
I think the core issue is that they usually do this, which isn't a surprise, only to add them again later as something 'new,' similar to how they eventually caved on re-adding the mage tower (and even when they originally tried to re-add it, they tried to make it limited time only to walk back on that too due to backlash). It is like you say, they could avoid this stuff entirely by not removing it but this has been the same team that likes to make problems so they can focus on developing solutions instead of new content.