I would definitely install a hardwired alarm control panel as recommended by the previous respondent epj3. I have a builder installed wired Honeywell system. It was a bare bones panel which I would discourage anyone from getting. The Honeywell Vista 21IP panel is an excellent panel that's also tied into your router for any future additions and if I had to do it over again would install it.. One IMPORTANT item I would definitely have installed is at least one alpha numeric keypad, the Honeywell 6160 is inexpensive and an excellent keypad. These types of keypads will allow you to EASILY rename your wired named sensors and much more. Now I'm not an expert by any means, just a do it yourselfer who has a bare bones wired alarm system, installed Hubitat, and wanted Hubitat to ALSO act as a full alarm system. I installed the Konnected INTERFACE system. It allows you to have your existing wired alarm panel with keypads. I also had concerns for my wife and not having a functioning keypad if I used the original Konnected system. I have to tell you, Nate of Konnected has EXCELLENT Youtube video's on installing either of his systems AND their help desk is FANTASTIC. I had the Konnected interface installed and Hubitat connected with Konnected in less than 30 minutes.
Now again, TOTALLY agree with epj3. By having a wired system with Konnected AND Hubitat Home security app running, you, in affect have 2 Home alarm systems and this is important. If you wish , you can run BOTH ,with no interference of either, at the same time. Your wired system is basically a SELF contained system. Its hard wired , doesn't rely on the internet, routers etc. Even if you lose power , they have a battery backup that can last for a few hours. I consider it my ROCK SOLID alarm system. Now, that's NOT taking anything away from Hubitat. My old wired system could NOT be controlled if I was away. I had no Idea if the alarm had gone off because it wasn't connected to a central station, but with Konnected and its integration with BOTH my wired system AND Hubitat, I'm now able to monitor the wired connected sensors. I installed a Version 2 Iris keypad to Hubitat and just like my wired 6160 keypad, I can arm and disarm it, with time delays, with no issue. It took me a week or two to iron out little glitches but Hubitat has worked flawlessly. Again, however, your at the mercy of your router and Hubitat power that can be aided by battery backups. I would tell my wife if she had any issues with the Hubitat keypad arming the system, rely on the wired system as a backup, but again Hubitat , as my alarm system ,has worked flawlessly AND you have the BEST community to help you with any issues. With simple wireless sensors combined with my wired system I can now monitor if my garage doors are open, any widows or doors are opened when I'm away. I can have lights and alarms come on if any sensor is breached and again ALL controlled when I'm away. I personally use Blink camera's which do NOT integrate with Hubitat directly, but with IFTTT integration, they integrate with Hubitat to arm with the Mode set to armed away and turn off with geofencing through IFTTT .
I LOVE the option of having both a wired and FULLY integrated Hubitat security system with the help of Konnected Interface system.
Hope that helps in someway to answer your concerns.