I have a TR-6S rather than a TR-8S.
For full disclosure, it was a b-stock item at half price, so having paid less probably colors my impressions.
As much as I like my Elektron (digi) boxes, it might be my favorite (purely) drum machine so far.
It was really easy to learn, and it’s just so immediate.
It’s loaded with great sounds too -particularly the ACB ones- and those are easily swapped out/managed via kits at any time.
I don’t touch the sample side of things at all really. I think I threw on a few samples of things like the Linn Drum, and that was it.
With the 6S in particular, there can be a lot of menu diving if you really want to get into the weeds with sound design. Less-so on the 8S; but for me, discouraging that is arguably an advantage.
With the Elektron boxes, I often get too caught up on things like sound design, all the options I have with parameter locking etc, or even the 2x8 grid layout they use vs a row of 16 (the row just works better for me).
I don’t find the 6S to be lacking, it’s just a different approach.
It gets me focused on composition, and makes that process really easy.
The portability of the 6S is a major advantage for me as well - though I know it’s not a factor for many.
I don’t think there is such a thing as a “perfect drum machine” and I expect that anyone looking for such a thing is probably going to end up with at least a couple of them that they’re happy with, which do different things.
But I can’t see myself getting rid of this, as it’s great to have when I want those bread and butter Roland drums - and it has the advantage of them being ACB rather than samples. There’s a reason their use is so prolific.
I like it enough that I’ve been keeping an eye out for an 8S too, if I find one at the right price (extra tracks, individual outputs, etc).
I can’t say whether it’s what you are looking for, but the 6S/8S are great machines.