should i be worried installing these two? what does it mean though?
(these are captured from Pop! OS software manager)
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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Xournal seems pretty trustworthy to me, so I assume it's for code simplicity (or age) or not being made with Flatpak in mind - just 'open any file/full filesystem access'' (for basic functions like opening files) and 'change system settings' for probably only a few features that change system settings.
I agree the permissions are dangerous and I commend Flatpak for incentivizing developers to use granular permissions.
As others (and you yourself have said), Flatseal's entire purpose is to edit Flatpak lermissions, so that one shouldn't be alarming.