LineageOS kernels are AOSP downstream kernels, and PostmarketOS has expressly deprecated their use. LineageOS is now working on running their system on close-to-mainline kernels, as provided by PostmarketOS and most Linux distributions.
Personally, it's not that the alternatives are so awesome.
It's when i meet against some awful design choices in systemd, like how it decides to wait forever rather than hard fail, and by wait forever, i mean wait for 30 seconds, no, 1 minute 30 seconds, no 5 minutes... you get it.
Or you can easily lock yourself out when there's a typo in /etc/fstab.
God forbid you used cgroupsv1 for anything when poettering unilaterally decided to punish everyone with a 30 second delay for using it.
If you stray off of the intended opinionated path, be prepared for the least user-friendly experience linux has to offer. You might even get some abuse from the developers if you try to ask for help, but they've probably toned it down since CoC became a thing (I hope).
God forbid you used cgroupsv1 for anything when poettering unilaterally decided to punish everyone with a 30 second delay for using it.
Intentional time-delays are a nice middle ground. Yes, it is annoying to the users who've ignored all prior deprecation warnings, but it's better than those same users being "surprised" when support is removed entirely. Maybe you'd consider it less of a "punishment" if systemd dropped support for cgroupsv1 outright instead of inserting a time delay, I believe the opposite.
Very handy for checking for drafts and cold spots, and also checking the fuse box and other electrical for hot spots.
The resolution is not amazing, 206x156, but it's enough for this type of work.
I have a friend who is happily using a flir one, with a resolution of 160x120 at his day job as an electrician and it is also enough for checking for draft, water leaks insufficient insulation, etc.
That oven works fine for roasting raw coffee beans as well. Raw beans keep a very long time if stored correctly, pity though they tend to be sold as a luxury product and thus priced to match that description. A popcorn popper of the 'modified heat gun' type (aluminium cup with slits in the bottom through which hot air is blown) also works well for roasting coffee.
Most PostmarketOS devices start out using LineageOS kernels, and many are atill using those.
Why not use PostmarketOS kernels on LineageOS?
The ultimate goals are different, but cooperation on upstreaming kernel work would benefit both.