I heard this same song and dance 5 years ago. The problems with the "IoT" market are foundational. Most IoT devices are not designed to be used for extended periods without internet access and a continuous stream of updates. The former means that, in general, they are only as reliable as your internet connection (including that crappy modem/router the ISP gave you). The latter means that unlike traditional home hardware, once you install "smart" devices you're at the mercy of the business plans of the vendor. So even if you get something set up that works acceptably, it will last 5 years tops (see Nest) before the vendor's priorities change.
Finally to address the "extra security" comment. Security from what? The developed world is objectively safer than ever, why would I invest in "solutions" to problems invented out of whole cloth? The paranoia of people installing cameras all over their own home (often cameras whose footage they have no real control over) astounds me. We're more mistrustful of our own neighbours than the companies that are actually exploiting our privacy and manipulating us psychologically for profit.