Technically they are, but in reality, none of the BEPs matter unless libtorrent implements them. Every modern client links against libtorrent for their torrent logic; when picking a client, you're just selecting what version of libtorrent and UI framework you want.

libtorrent is solely maintained by Arvid Norberg who happens to actually work at another blockchain company, Blockstream. If you want to do one thing to support the BitTorrent ecosystem, it's to contribute to libtorrent to reduce the bus factor.