This is a completely fair argument (visible progress versus “unused” space). I think when Disney has done this, they’ve been able to better hide the unused infrastructure than Universal is able to so the lack of accessibility isn’t as glaring (historically, the Odyssey restaurant was the biggest issue but they had several unused facilities for years). Even WoL, for as big an eyesore it “is” is positioned in a way where if you don’t really know it’s there you have to actively look through the trees to know it’s there.
The Lost Continent debacle is, unfortunately, a unique situation. Universal has known for years the land would go. Sindbad was an under-attended, poorly rated show that (from my understanding) needed infrastructure repairs to the stage. Poseidon had a significant guest-safety mold problem. I think both were forced to close before Universal would have “wanted” them to, but the question was “is the cost of the update for the short-term worth it?” Universal felt it wasn’t, and determined that “risk” of unused space on guest experience was maybe… negligible? The unused theaters have not seemed to negatively impact guests perception of the resort. Short of wider economic issues, they’re doing well.
In the grander scheme, I wonder how much of a deal-breaker that stuff is for casual guests. I don’t know if it’s a situation where, they don’t know about what they’re not missing so they don’t care or if. Maybe, because there’s a half dozen guest-inaccessible soundstages between the North Campus parks, guests improperly assume the unused theaters are related to that. Regardless, Universal seems to view any perception risks as acceptable.
In the grander scheme, I do think Universal has a plan and will be acting on them quickly. They’ve been aggressively since Comcast took over. And while the lull at the North Campus negatively impacted those parks, it was because Comcast was building a new park. We’re seeing active movement in a three parks now. It may not be the activity fans want to see now, and the end results may be more Superchargedes or Monsters Unleashedes, but the activity is happening.