Maybe it feels a little cramped when going through show scenes under other showscenes. Or too tight narrow-ways. If they have to change the building height or width in any way, literally all the math has to be re-done. I could see that being a big slow down on progress.Well, I did find out a bit of information. It appears there was or is problems with scale regarding Mario. Scale issues with tech and throughput. Now what the scaling exactly pertains to I do not know but it does jive with what Alicia heard.
My take: For there to be delays, I would think the scale is regarding the vehicle tech and number of cars on the track at any one time; making them do what they want them to do. On the other hand, it might be the issue of AR, but I would doubt that would cause delays in construction.
This information comes from inside, but not as deep inside as I would prefer.
Hopefully whatever it is gets worked out and the extra wait means better ride.