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As it allows you to "freeze" and "thaw" even system apps to see if stuff breaks before uninstalling stuff.
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Titanium Backup, an app that used to be an excellent app, but has slowly become less effective as it hasn't been updated in years (and requires root) can be helpful in this stuff as well. However beware that some devices you can trip say Knox (Samsung) by doing so. Also keep in mind rooting doesn't have to be permanent, you can unroot your device as well if you are concerned about security. If you don't want to root you can see if a debloated ROM is available for your device. If you can't disable them you will likely need to root.
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If you can disable and them and nothing bad happens, then generally you can remove them safely. Sometimes you can find debloat lists for your particular device (XDA typically has dedicated threads for this).
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