Hi.
Disney parks do have specific requirements for ride manufacturers regarding the safety and comfort of their guests, including those who are larger or have disabilities. These requirements may be stricter than those of other parks.
For example, Disney has a policy called the Accessible Ride Vehicle (ARV) program, which requires ride manufacturers to design vehicles that can accommodate guests with disabilities, including those who use wheelchairs or have other mobility impairments. The ARV program also specifies that ride vehicles must be designed to accommodate guests of different sizes, including those who are larger.
In addition to the ARV program, Disney has a Guest Assistance Card (GAC) program, which provides assistance to guests with disabilities, including those who require special accommodations on rides. The GAC program may allow guests to use an alternate entrance or access vehicle modifications, such as larger seats or restraints, to accommodate their needs.
It is possible that the combination of these programs, along with Disney's emphasis on guest safety and comfort, may lead to ride manufacturers designing vehicles with larger restraints or other modifications that better accommodate larger guests. However, it is also possible that the ride experiences at Disneyland Paris simply happen to be more accommodating for larger riders.