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@gbj_tester
7800 hubs are "10-speed only" due to the aluminium freehub having deep splines which only fit 10-speed cassettes. Any 8-speed or higher HG freehub (Shimano or compatible) will take a 10-speed cassette with a 1mm spacer behind the cassette for most (exception to the spacer rule is 'junior' geared Ultegra cassettes).
In other words, there are dozens of hub or complete wheel options which will take a Shimano 10-speed cassette.