I think Kubota official language and the way people typically talk about it doesn't line up well, so what you're seeing on the build page may be something different than you think.Somewhere on the forum I read that the Swift-Tach coupler was problematic but I don’t see a different option.
I believe the swift-tach refers to either connection system - so the method of removing the entire loader arm assembly can be either a through-pin, or a kind of clip on solution. Either can be removed whilst sitting in the seat. I think the through-pin is more durable, but both seem plenty durable for the purpose unless you're working the loader hard (and particularly if you're banging into things, rather than just lifting things).
The clip-on type comes with the ganged hydraulic hose connection, with flat face couplers. Some people have reported leaking on these - there was always amazement that Kubota could afford to put this system on the tractors, and it may be that they cut some corners on quality to hit a price point.
Personally I would get the single lever coupler anyway, because I take my loader on and off, and I'd put up with a bit of weeping from the joints in order to avoid having to pull the pioneer couplers off one by one - it's a pain and gets oil all over you. Unfortunately in NZ that isn't an option we get (apparently NZers are tight arse with money and won't spend the extra $1K NZ that it actually costs on the wholesale price of the machine). So I have the pioneer couplers (older style), and they are relatively stiff, and in a somewhat hard to reach location (also hard to get banged by sticks and branches, so I see why they are where they are). I often graze one or more knuckles getting them on and off, and it's irritating.
You would typically take the loader on and off to mow. You wouldn't be mowing with it, so you may take it off very rarely. In that case the older style would be fine. But as you say, hard to get. But check the naming of the parts very carefully, it may be that there are two types of swift-tach, rather than you not wanting swift-tach at all. I definitely recall people saying the could option the old-style.