Generally if you want a newer version of a program than is available in the stable repository, then you check to see if it is available in the official backports. However, it appears that Dolphin is not there. So, you have the option of trying to backport it yourself from Sid's source (instructions here: https://wiki.debian.org/SimpleBackportCreation). Lastly, if backporting is not possible, then you can try Apt-Pinning (aka Apt Preferences) of your sources.list to have a minimally mixed system (see here: http://jaqque.sbih.org/kplug/apt-pinning.html and a description from the Debian wiki: https://wiki.debian.org/AptPreferences). I've had a mixed system with pinning, which was basically stable but with a couple of inconsequential programs installed from testing, and it was fine (it is a risk, though, so do a backup first). However, it is best to try backporting first.

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hm.
i think the kernel isn't such a representative example here; it would be interesting to have more comparison points.
also, i use the LTS kernel, currently at 4.14.67-1-lts.
i use only archlinux on my desktop, so can't compare much.
all i really want to say: a rolling release can be very stable.
for years.
additional maintenance beyond upgrading, maybe once a year.

yes, possibly.
i didn't even know there's a fourth one...

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I made a mistake and posted a reply to this thread as a stand alone thread. If anybody wanted to comment on that one, I'd highly appreciate your insight. Thank you again for all of your help and guidance .

^ spammer chinachin reported (there's a link hidden in my quote).
The techniques they use, they seem to be
a) manual spammers
b) rather specific tot he quirks of one particular forum software
So much work for so little gain! I wonder how much they get paid for that.