Which binaries are required to run a headless node?

There are plenty of guides on installing Bitcoin Core on Linux, and the most popular advice is to do this:

install -m 0755 -o root -g root -t /usr/local/bin bitcoin-0.21.1/bin/*

Here is an unarchived file tree:

.├── SHA256SUMS.asc├── bitcoin-0.21.1│  ├── README.md│  ├── bin│  │  ├── bitcoin-cli│  │  ├── bitcoin-qt│  │  ├── bitcoin-tx│  │  ├── bitcoin-wallet│  │  ├── bitcoind│  │  └── test_bitcoin│  ├── include│  │  └── bitcoinconsensus.h│  ├── lib│  │  ├── libbitcoinconsensus.so -> libbitcoinconsensus.so.0.0.0│  │  ├── libbitcoinconsensus.so.0 -> libbitcoinconsensus.so.0.0.0│  │  └── libbitcoinconsensus.so.0.0.0│  └── share│  └── man│  └── man1│  ├── bitcoin-cli.1│  ├── bitcoin-qt.1│  ├── bitcoin-tx.1│  ├── bitcoin-wallet.1│  └── bitcoind.1├── bitcoin-0.21.1-x86_64-linux-gnu.tar.gz└── laanwj-releases.asc

So it looks like this command copies six binary files and it doesn't install man pages. Is it necessary to copy all of those binaries to run a headless node without any issues? I've been using bitcoind and bitcoin-cli directly so I'm pretty sure they're required, but I didn't find any info on the rest of the binaries.