Yes, two interfaces different use cases. TAs might work better for caching and clients that rely on the producer-consumer pattern (producers publish all, consumers can get these async anytime). Request/response patterns also work for that, but some people might argue that it is more complex (?) In any case, I think Relatr is the only service out there that satisfies both interfaces. It can be configured to publish TAs and it naturally fits into the request/response pattern through CVM. It also supports range lookups for a list of public keys.
https://www.contextvm.org/s/750682303c9f0ddad75941b49edc9d46e3ed306b9ee3335338a21a3e404c5fa3
