I am/was (?) a hobbyist and have a small SUV with bike racks on top. I have the Festool rails, connectors, special screws, and Betterly connector. The longest rail I can get into my car is the 1900 (75"). That's my favorite rail for many things, especially breaking down sheet goods.
I rough cut sheet goods at the supplier and load them in the back of my small SUV along with my saw, and dust collector. The supplier is a long way from home. Once loaded, I no longer have a safe spot in the vehicle for the rail. Getting the rail to the supplier is no trouble. Getting it back home safely, however, becomes a hassle.
I could bring shorter rails and all the connection gizmos with me and live with the inconveniences, or I could strap it to the bike racks. I don't keep the straps in my car, and even if I did, I'm concerned that a gusting cross-wind on the highway would bend the rail.
If I bring shorter rails and forget any essential connection-related accessories, sheet break down and rail transport becomes much more difficult.
Additionally, I treat the splinter guard gingerly on the rail connection flips, AND they often come unglued regardless. I know my cuts are straight, but I don't count on the accuracy of the cut line. These little annoyances and non-value added steps accumulate over time to lessen my enjoyment of the tools. It's "death by 1000 cuts".
I'm considering buying the Mafell saw, rails, connectors and bag just to make this task less of a hassle. I want to go, get my stuff, and get home and get to work. What a fussy hothouse flower I am.