>>>De Beers spearheaded the idea of getting engaged with a diamond engagement ring with its mass advertising only seventy five years ago. This is a newfangled idea. It has no place in Jewish tradition.
It’s possible that a diamond engagement ring is a recent innovation but the general concept is not. The Gemora talks about the customary gifts Chasanim send to kallas. The Torah talks about the jewelry Eliezer gave Rivka. Some of this is just current style. Just imagine a Chosson giving a nose ring like Eliezer did today
>>>The same with brides wearing a white gown for their wedding. It only first became a thing when Queen Victoria wore a white gown to her wedding.
It is extremely unlikely that some who got married in the 1800s set the precedent for all brides even in many parts of non-western society.
Secondly apparently frum kallas wore white for a very long time. From the reasons given for why Ashkenazi kallas do not wear any jewelry under the chupa is because due to the kedusha of the moment she should be symbolically dressed like the Kohen Gadol in the Kadosh Hakodoshim on Yom Kippur who removed his gold clothing and wore only wore white . Another reason is that similar to the choson who wears a kitel under the chupa. (among other reasons ) to be reminiscent of Yom Kippur when we wear white we want her to do the same
I agree about the hotel room.