The original Enterprise made it to the very edge of the galaxy, and the Enterprise A made it to the galactic core in canon.
Not extensively, it pop out briefly and came back which I have to Include original Enterprise brief trip to Andromeda. STO had tendency to do ground breaking for it's time. However, these with Enterprise and her follow-on sisterships of later generations experiencing these incidents happened after words from STD.
However, were talking about Discovery, doing the incredible things before Enterprise was taken over by Kirk. Last time I check, were also pointing out, that were suppose to be in less high-techish time period, galaxy hopping wasn't normal thing. Delta Quadrant was unheard of, so we run into this problem of Discovery re-writing Star Trek's primary lore for fast ratings, arguably cheapening older shows experiences for fans and wiping out lore. CBS been arguing with player base this is the prime timeline, which it IS NOT. Too much been re-done and re-imaged. If Star Trek Enterprise can AT LEAST get the technology of USS Defiant, during that Mirror-Mirror universe episode done right, then they could have done it with Discovery.
My point, I won't jabber about again. Is what
I've already disavowed any claims that ST:D is prime timeline or an actual prequel. Any names are just a coincidence, yes including the supposed "Klingons".
What this guy said. It's clearly, this is a reimaged Star Trek, this is CBS Canon universe, ITS prime timeline. I suspect maybe if we the fan base wants to put it, it's they legally can't present the original Star Trek Timeline due to their break up with Viacom. Movie rights and the Television rights were split down the middle. That said, it's bad marketing to admit this whole new Trek universe and playing the vague game discounting this different from Gene Roddenberry's original telling of Star Trek.