But these do act as explicit confirmation that it is possible to begin with. You're also ignoring my earlier statement regarding how "choosing where you want to go" doesn't give you any strict reason to believe what you're being shown isn't a microcosm.
Yes. You're assuming a retcon when it's not explicit—an explicit retcon would be making the Nerubians take their architecture from the Shadowlands to retroactively connect the Scourge to Maldraxxus and explain the reused designs. This is something you are interpreting as a retcon instead of accepting reality. There exists a realistic reconciliation between these details, unlike the Nerubian situation.
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So, the Fel can send you to the Twisting Nether with a sufficient amount to physically warp you, but not the Light?