Sorry, in a bit of a rush.
If you search my profile I've made plenty of posts about the same kind of thing. I'll never quite understand the fascination with expensive custom smart products when (for me) most of this can be achieved very, very easily and very, very cheaply.
The answer I've heard back prior to this, is that people don't want the inconvenience of needing to send power to various locations round the home. And obviously, this solution is wired.
Search for konnected on this forum. It's a doddle. Essentially, buy a few cheap nodemcu's (WiFi) and flash with konnected to link into hubitat.
Each needs powering with a dc supply. Personally though, I use a single 30amp psu (12v) and drop down to 5v at the point of each nodemcu with a cheap 12v-5v USB device.
Inside, I use standard home alarm style LC pir's powered by the 12v linked to the konnected boards via the NO/GND on the pir's. Cost about 8 quid each, work ace.
Outiside I use the same approach, but via an ac relay to detect when the external AC pirs (about a tenner, screwfix) are activated.
All very, very cheap.
Very, very reliable.
Utter doddle to replace with off the shelf parts as opposed to seeking advice for the current recommendation for a replacement 50 quid smart sensor because your precious favourite is no longer manufactured. Stuff that. I like simplicity and reliability.
But each to their own.
I use the exact same approach for standard ac trvs on my central heating system, and various other projects including door/window contact sensors etc. Never needed to adjust. Their all ace.
IMO, for me, zigbee etc is utterly overrated and overpriced. This gear does the job, does it well, and doesn't require battery replacement. And more importantly, costs about 2% of the custom equivalents when adding multiple contact sensors etc. To be totally clear, I have say, one single nodemcu near the front entrance. This controls door contact sensor, indoor pir, radiator in entrance hallway and a 12v keypad for arming shm. Oh, and a temp/humidity sensor. Keypad cost a tenner, BTW. Total cost for that would run at around 30 quid. Tell me how much that would be to recreate with some version of a zwave keypad, motion sensor, contact sensor and humidity. I know my preferred route.