Of course, I get it from Apple's perspective, they dont want AirTags to be used to tail others. However, that precludes it from being used for theft tracking.
For example, I use an AirTag on my bicycle. If someone steals the bicycle, they are literally informed "an air tag is following you" https://support.apple.com/en-us/119874
There are a lot of things I'd love to put long-term AirTags on (luggage, snow-blower, childrens' backpacks) but if theft isnt really deterred, then the case for a bulkier AirTag is quite reduced.
I use an AirTag on my e-bike - there’s quite a few hidden mounts out there that look like normal rear reflectors or slot in between a water bottle cage and the bike frame. It’s also trivially easy to pop the AirTag open and remove the speaker so it can’t beep.
I bought my AirTags before there were any compatible third party options, but the non-Apple AirTags don’t have the UWB chip inside and don’t support the precision finding feature which would also make them more difficult to find.
I have found that "machine is online" is usually not what I need monitoring for, at all. I'll notice if it's down. It's all the mission-critical-but-silently-breakables that I bother to monitor.