I don't think having the same amps in an active multiway is a bad idea at all. It's usually avoided due to cost but there is a big advantage: sonics: all the amps present exactly the same "sound" or character to all drivers. This removes one variable in achieving an integrated system when you go active. It also assures the user that the system has little chance of compromised dynamic range. Headroom in amplifiers is never a bad idea.
BTW-active does not have to be a digital. ATC makes all analog active systems and has done so for many years. ATC also uses the "same amp" design principle, but they build three amps using the same topology and parts and outputs but with 3 different output power capabilities to match up drivers sonically, without spending extra on larger power supplies, output devices etc where you don't need them. ATC actives enjoys an excellent reputation for dynamics, perhaps proving the point. Its one of the reasons they are popular in studios where dynamics are definitely excessive when tracking. In the mix stage, one applies compressors or other methods to reduce dynamics, but in the tracking (capture) phase most engineers prefer to leave the signal as untouched as possible.
Brad