One buys a ticket for transportation in a class of service.

I anticipate that Andy and I would accept as evidence a U.S. court case, finding for the applicant against Delta in the matter of a different business class seat constituing a material negative impact, if anybody thinks the flexibility to substitute equipment as established in the C of C isn't binding in this matter.

Seconding advice given the OP: the 176-degree recliners on the A330s are good enough that I wouldn't - for a minute - consider a connection to get the lie-flats on a 764 DTW-FRA.