even if you're not OP on server and dont have commands you can still get wither egg (since it's not on creative menu) by pick block function on a nearby wither.
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Yeah, this looks more like an oversight to me than an intended choice. Either they (or just wither) should just be in the inventory, or pick block result should be OP only for them. No point in making them command only if you can just get it via pick block.
As for dragon not having a functional pick block, that should be another report.
the thinking is if someone doesnt have access to commands (needed to get the wither spawn egg) then they shouldnt be able to easily get the wither egg just by pick block'ing it. Ender dragon cant be picked block.