I am not sure why this is but since the last patches, both: Hyper/Giga Coasters Rage and Titamet have been limited to the real world stats of Fury325. The idea behind it is not bad as its refered from the real world but as Tiamet is an Intamin Hyper/GigaCoaster and Rage is a B&M Giga Coaster both Coasters are different.
With limiting both rides to stats of Fury325 made by B&M means that some Hyper/Giga Coasters made by Intamin can not be rebuild in Planet Coaster. Even some Elements such as a Stengel Dive can not be used currently on a Hyper/Giga Coaster due to the limitations.
Example of Intamin Coasters which can not be rebuild exactly due to the limitations:
1) Skyrush at Hershey Park, which is the real world example of Planet Coasters: Tiamet features a 85° drop and has 140° Overbanked Turn.
2) Intimidator 305 uses same track as SkyRush but as 2-Seater Trains and has a 85° First Drop
3) Millennium Force is famous for its 122° Overbanked turn after the 80° First Drop.
Intamin Cable Lift:
Since Millenium Force, Intamin is famous for those fast Cable Lifts they use on their Hyper and Giga Coasters. While in real world the Cable Lift ends within the Drop to get the trains over the crest, in Planet Coster the Cable Lift ends in the middle of the crest.
Pictures of some mentioned Coasters:
Millennium Force: First Drop and 122° Overbanked Turn
Goliath, Walibi Holland 121° Stengel Dive
85° First Dop of Intimidator 305
Better limits for Tiamet and Rage allow more creativity:
When it comes to limitations i would use the B&M and Intamin coaster stats as reference and than set the limit for height, banking and drop angle to a slight higher value so that the Player is allowed to be creative beyond the real world reference and is able to create it's own coaster designs which can be still realistic.
New Limitations for Tiamet the Intamin Giga Coaster
+ Height: No Limit
+ Drop: 89
+ Banking 150°
+ Inversions: None
New Limitations for Rage the B&M Giga Coaster
+ Height: No Limit
+ Drop: 85
+ Banking 110°
+ Inversions: None
With limiting both rides to stats of Fury325 made by B&M means that some Hyper/Giga Coasters made by Intamin can not be rebuild in Planet Coaster. Even some Elements such as a Stengel Dive can not be used currently on a Hyper/Giga Coaster due to the limitations.
Example of Intamin Coasters which can not be rebuild exactly due to the limitations:
1) Skyrush at Hershey Park, which is the real world example of Planet Coasters: Tiamet features a 85° drop and has 140° Overbanked Turn.
2) Intimidator 305 uses same track as SkyRush but as 2-Seater Trains and has a 85° First Drop
3) Millennium Force is famous for its 122° Overbanked turn after the 80° First Drop.
Intamin Cable Lift:
Since Millenium Force, Intamin is famous for those fast Cable Lifts they use on their Hyper and Giga Coasters. While in real world the Cable Lift ends within the Drop to get the trains over the crest, in Planet Coster the Cable Lift ends in the middle of the crest.
Pictures of some mentioned Coasters:

Millennium Force: First Drop and 122° Overbanked Turn

Goliath, Walibi Holland 121° Stengel Dive

85° First Dop of Intimidator 305
Better limits for Tiamet and Rage allow more creativity:
When it comes to limitations i would use the B&M and Intamin coaster stats as reference and than set the limit for height, banking and drop angle to a slight higher value so that the Player is allowed to be creative beyond the real world reference and is able to create it's own coaster designs which can be still realistic.
New Limitations for Tiamet the Intamin Giga Coaster
+ Height: No Limit
+ Drop: 89
+ Banking 150°
+ Inversions: None
New Limitations for Rage the B&M Giga Coaster
+ Height: No Limit
+ Drop: 85
+ Banking 110°
+ Inversions: None