Yes, maybe, but (IMHO) a "out-of-the-box" compressed file (+ included install.sh script), like fpc does, has some advantages.
Yes, it is true. Somebody should only make those compressed packages during each release. Nobody has done it so far.
Because Ubuntu + Mint are the kings (I know, it is sad, see classement) ---> http://distrowatch.com
It only means that many other people use them, or at least look for information about them in distrowatch.
Those people may do it out of old habit, just like people here do.
I finally switched to a rolling distro because I wanted latest release versions of many programs. FPC was only one of them. I want latest features and security fixes for my browser. I want the best possible version of KDE. A new version of Plasma 5.x is practically always better than the previous. Why would I use a 2+ year old version?
I waited with the switch so long because I feared rolling distros are too unstable. It turned out to be the opposite. Manjaro has worked without issues. Earlier my Mint and Xubuntu got screwed when I had installed 3rd party packages. With Manjaro I don't need 3rd party packages because it already has the latest of everything. I believe I could break it by tweaking but I don't need to.
Both Arch and Manjaro have a huge selection of packages in their repos. I don't know who updates them all.
It is interesting to see how people stick with one distro because it was a cool thing over 10 years ago. Things have advanced since then.
Seeing the time wasted for discussing installation problems in this forum, the situation makes no sense.
I hope everyone with the problems will check if another distro would serve his needs better.
I have earlier mentioned SparkyLinux which is a rolling distro based on Debian testing. It updates packages too slowly for my taste but it could be a good compromise for people who are afraid of "bleeding edge" updates.
It does not have FPC 3.0.2 yet. It has now KDE frameworks 5.28, released over 4 months ago. Still much more recent than in Ubuntu derivatives.
Anyway, please remember that even the fast bleeding edge updates contain only
released software. A new release is typically better than an old release. I don't see why a desktop system should hold back updates.