"Has Envoy some sense nowadays?" - probably not but I haven't looked much into it. It doesn't use any encryption, and while it maybe felt fast in the 1990s - the protocol introduces heavy CPU overhead on classic Motorola 68k processors, severely limiting throughput compared to lightweight modern alternatives. It also uses its own proprietary network protocols. It does not natively talk to Windows, macOS, Linux, or modern NAS devices, so you would still need SMB, etc, to speak to anything else.