they have done this for quite a while if I recall correctly, they did this during oktoberfest as the gardens don't have enough lighting, meaning it is a large hazard walking round them at night
like wise the rapids have been closed after dusk due to saftey concerns (rapids are a more dangerous ride, as they have large water currents and if you fall in your chances aren't good)
I don't think closing CBeebies or shark bait early would make much of a difference on the queues of the rides (unless 5 year olds are now able to ride nemesis) it will be busy because it is always busy, I recall John Wardley said in his book Halloween is the busiest time of the year. avaliability will be another question though and I do wonder on how busy CBeebies would be after dark.
Sharkbait isn't used exclusively by 5 year olds. Cbeebies is predominantly designed for
under 5 year olds. Regardless of which 5 year olds are riding which rides, they don't visit the park alone, they have paying parents with them usually, and sometimes older siblings. And when they're away, they don't tend to go to bed at 6pm. Where do they all go after Mr Tumble and Postman Pat tell them to F-off because they're no longer welcome after tea time?
Being busy doesn't have anything to do with it. I've been going to Scarefest since the 2000's. I'm aware that it's busy, but you used to have 11 hours of the park being open throughout, and far more attractions to experience. That's the point.
If they've not let us in the gardens after 4 of 5pm at Scarefest for a while, I haven't noticed. First I've heard of it anyway. I wouldn't call it a "large" hazard walking around outside areas at night, a normal activity that the majority of us have frequently done (as well as being trusted to wait on train station platforms). But I get the lighting situation, and the potential hazards due to the uneven surfaces and remote location. But it's not dark at 5pm is it?
The rapids have only closed at dusk for a few years. In fact, it happened in the middle of a Scarefest a few years ago. I was riding them in the dark the night before, and they closed at dusk the following evening and have never reopened after that time since. Although I miss this and used to enjoy a night ride on them, I half get the safety reasons, although they could just light them if they really cared about guest experience (they don't).
But either way, with all this stuff closed, and ride availability being consistently poor this season, it's a recipe for a degraded experience compared to previous seasons wouldn't you say?