Shockwave only has 1 train built up, no idea when it last had 2 available
This is true, just like Storm Force 10 only has 5 of it's 10 boats essentially built up. The start of the issue is, that they have another train, built or not, needing parts or not and they have 5 boats, built or not and again, needing parts or not.
Then the major part of the issue arises when they decide to charge you extra to skip the queues, while purposely not building up the other train and boats. Very shady business practices in my opinion. Especially as they have and are making the conscious decision to keep the capacity of both rides essential at 50% of what they can hold from the hardware they already own, then charging you for the 'privilege' of skipping said queue.
Maybe we will see them built up as time goes on. But for now, they should not be charging fast track while having capacity they have decided to not use, for whatever reason. Pure ripping customers off, both by having to buy fast track then for the extended queues for normal paying customers for two rides with an already limited capacity plus fast track on top.
Both rides could co exist with extra capacity and fast track too, it is not like it is one or the other. Maybe for part of the season, but there has been quite a few times this summer where queue times for both have exceeded 120 to 140 minuities.
This is more than likely something they inherited from the previous owners, but they have decided to not spend the money since then to fix them, then they are the ones who have decided to introduce fast track.
As far as things go, it is a relatively minor nit-pick I guess, but a specifically bad one I think.