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I don't think there's a single answer to that, but I got a few points that may be the more prominent ones, in no particular order: a) Their (now changing) stance against unfree firmware files. This made the default adverdised installer fail most laptop installations due to the WIFI firmware not being available, so no internet to pull down the required packages to make it work. There were unofficial ISOs, but they were hard to find and so a frustrating experience if you didn't know about it. Same, but not as worse with other unfree stuff, like NVidia drivers, you are required to enable the non-free repos, which makes totally sense if you check it out more closely but still a bump in the road for users new(er) to Linux or only used Debian derivatives that often have a stance that is (relatively) less freedom oriented.
As hinted, the firmware situation recently changed and will get better with the next major release next year. b) It's more universal and flexible to go in various direction, so it comes with a less opinionated out-of-the-box experience, for the better or worse (depending on your preferences). For example, Ubuntu provides a Server and a Desktop edition, and then all the semi-official Desktop spins for KDE, XFCE, ..., but Debian doesn't you can get it to move in either direction quite easily once you grasp its basics, but that naturally still is an overhead compared to just pulling a preconfigured "ready to fly" version ISO. c) It is definitively is sturdier, but due to their policies guaranteeing that it's also less bleeding edge, well at least if you use the stable release. You can run the Debian Sid version (unstable), but the project doesn't want to promote that to inexperienced users. FWIW, I run that on my laptops since years and got an excellent experience. It's a rolling edge version of Debian, fresh as Arch, but I just align a bit better with Debian (plus develop on it at work). There are surely some more, but those where the biggest three popping into my head. The great thing about Debian, they got quite a healthy relationship to most of their derivatives. Which could IMO only happen due to not being run by a major company or the like, but 100% community based. While that sometimes makes for slow turning mills, but still (or maybe exactly because of that) an excellent and safe foundation for their users, be it direct ones or indirect through derivatives. |