anything that's connected to a wifi will end up in some server, unless it's closed circuit. even then it's a security issue, until everything is end to end 100% encrypted, no one should trust smart homes.
Why? You lose your phone or compatibility with latest OS version and suddenly you can’t even open the door or bring the lights on…
Not the target of the article but another guess would be repairability: while local craftmens around do wonder with wood, steel and electricity, good luck finding someone being able to properly debug a locked-down proprietary digital system!