I also think they need more rides with height restrictions of 1.3m.
Actually, quite a lot of alton towers rides are at 1.2m or lower and are suitable for the age group you mentioned, for example:
Personally, I don't see the point in a thrill ride having a height restriction of 1.3m if it can have a height restriction of lower. Just because a ride has a 1.2m height restriction, that doesn't make it not for thrillseekers
Because 1.2m includes quite young children, therefore AT has to make the ride suitable for young children. Thirteen (apart for the drop) is quite boring and not thrilling. When it gets to the drop a lot of young children dont like it. Parents trust that when their child is tall enough for a ride, its not going to terrify their children (kinda like thriteen does a bit). Having 1.3m means older children (9/10/11) will be able to ride a ride thats more thrilling than those at 1.2m and younger children (6/7/8) wont be able to ride and get terrified of all rides in general. Plus 1.3m is that annoying stage where you are too small for the good rides but too old to find the small rides as good as they were when you were younger. 1.3m gives AT the ability to make a midway point between huge thrills like the smiler and low thrills like 13.
^ But do they? They run only one arm, on half of its capacity on the most busy of days.
I agree with this as well, Submission is losing its popularity. AT was going to close them for the Smiler. Plus how many children do you see on Submission? not many.The Blade is planned for removal. So there wont be many left. Therefore more is needed, and as 1.3m allows AT to make them more thrilling, they will be more popular.