Long ago, I tested Honda's stonking great CRF450RX. It's a brute of a thumper, capable of just going wherever you point its knobby front tire. I took it through our backyard's infant dirt track, up into the mountains on some semi-maintained trails, and through some gnarly single track. The race-spec dirt bike never missed a beat.
My only complaint was that it didn't have a headlight. And while there is the CRF450RL, the headlight is, well, not that great according to most who've run it in the early morning until nighttime. There were a few other minor quibbles, too.
Honda, however, has the parts to make the CRF450RX perfect. And the company will begin selling those parts to European Rally Raid teams starting this year. But those parts are only for those teams, and no one else. That means, despite Honda having the parts to nix all of my issues, the company won't sell them to me or you.