Because imo... that is the answer. We have seen so many stupid closed ecosystems of home automation stuff come and go, I dunno why you'd mess with anything else at this point. In fact I just got another email reminder that Google is turning off the old Works with Nest stack. Remember Nest? Yeah...
I totally get how that's off-putting, but the real recommended way to run home assistant is to install Home Assistant OS on dedicated hardware. Which also can be off-putting.
Either way, it's my favourite software that I regularly interact with (unless you count Linux).
The "Supervised" installation (i.e. installing Home Assistant on top of an existing Linux install) is doable, but not preferred.
so thanks for keeping it around :)