It's a rock-solid distro, and if I had a use for enterprise support, I'd probably look into SLES as a pretty serious contender.
The breadth of what they're doing seems unparalleled, i.e. they have rolling release (Tumbleweed), delayed rolling release (Slowroll) which is pretty unique in and of itself, point release (Leap), and then both Tumbleweed and Leap are available in immutable form as well (MicroOS, and Leap Micro respectively), and all of the aforementioned with a broad choice of desktops or as server-focused minimal environments with an impressively small footprint without making unreasonable tradeoffs. ...if you multiply out all of those choices it gives you, it turns into quite a hairy ball of combinatorics, but they're doing a decent job supporting it all.
As far as graphical tools for system administration go, YaST is one of the most powerful and they are currently investing in properly replacing it, now that its 20-year history makes for an out-of-date appearance. I tried their new Agama installer just today, and was very pleased with the direction they're taking.
...so, not quite sure what you're getting at with your "Back in the day..." I, too, remember the days of going to a brick-and-mortar store to buy Linux as a box set, and it was between RedHat and SuSE. Since then, I think they've lost mindshare because other options became numerous and turned up the loudness, but I think they've been quiety doing a pretty decent job all this time and are still beloved by those who care to pay attention.
Since Linux has no concept of a base system, it's a stand-alone kernel with a hodgepodge of crap around it - this distinction makes no sense on Linux.
/opt is generally for software distros for which you don't have source; only binaries. Like commercial software packages. More common on Real UNIX(R) because most Linux users outside enterprise aren't running commercial software. You're putting your $500k EDA software under /opt.
And I say this as a very light social media user, I never enjoyed it and it always felt unhealthy so I just kept off it. As I’ve watch it all unfold, was in college during facebooks college only explosion and now people are on tiktok. It’s clear, people want to be addicted to social media just as bad as zuck wants them addicted to social media. And an instagram without filters is like porn without nudity.