For sure It is a bit of an issue. And it is something that is slowly bht definitely being worked on as a next phase. That is why recent focus was on kid appeal. DreamWorks and Illumination. Needs more.Disney is absolutely, undoubtedly, "other affirmative word" more accommodating to families than Universal is. I have to believe it is a conscious decision by Universal to push their attractions to be for families that are no longer using strollers.
Basic dark rides have height requirements and roller coaster restraints. There is very little for a child under the age of 3 to do in a Universal park.
Very different from the early days when Universal Sudios was entirely accessible(even when scary)
Disney is fine lately taking that change to more limiting as their recent builds are primarily coasters. Saving grace for them is the design has been 42 inch for Guardians.