first of all, it only searches for occurrences in already installed packages and is more or less a grep -l xxx /var/lib/dpkg/info/*.list. So you can’t use it in order to determine which package to install, for that you use packages.debian.org or apt-file instead.
Secondly, what you search for isn’t relative to anything (wtf):
mmmh, I bet I will not notice any difference also if I don’t do shit and keep whatever is working until the day I’ll have to switch because my distro drops the packages 🤷🏼