Life is too short to struggle and play games with the spyware that ships on phones by default nowadays. Better to be able to blow it all away.
I won't buy one that doesn't have an aux port. Do you know any lineage-supporting modern phones that have an aux port (and an SD slot, ideally!) by chance?
You can’t use that tool’s SD Card column right now, since its code hasn’t been updated to match the LineageOS wiki’s new data shape. (I fixed that bug locally and plan to submit a PR.)
I hope you're not implying LOS is only useful for old devices.
LOS supports many relatively new devices, including many flagship phones. It also arguably offers much better experience than the default bloatware-ridden OEM OSes, which is the reason I check which currently sold devices are supported before buying a new phone.