My question is about the general security of using Bluetooth in a highrise apartment building. I am not a software developer, a network administrator, nor do I work in IT. When needed, I "code", loosely speaking, but using 4th generation languages for data analysis, and not in a way that is relevant to my question. In terms of the acceptable topics listed in Q&A forum's help page, I hope that my question falls under "risk management". So my question is about the overall security risk of using Bluetooth relative to using Wi-Fi, and not about the technical details of specific forms of attack.
According to this recent article, Bluetooth is generally more secure than Wi-Fi . My laptop and iPhone use home Wi-Fi to connect to my home router to access the internet and access each other, which already exposes me to risk that I have accepted. Does using Bluetooth to stream music from iPhone or laptop to a boombox expose me to less risk? If so, it's not worth pondering. If not, or if it isn't clear, then I have to ponder my next move.
Without having used Bluetooth before, I will describe the details at home, where I will be using Bluetooth. The only devices that will use Bluetooth are my Windows 10 laptop, iPhone, and a boombox (which is what I'm shopping for). I expect the laptop and iPhone to be "Masters". I don't care if someone knows what audio content I listen to, but more about using Bluetooth to attack the master devices. I will not wire an audio player to my current master devices, as suggested in the comments here. But I keep both the iPhone and laptop updated. I don't expect that the boombox will be update-able. My rental apartment is on the 9th floor, away from the street. It seems to boil down to whether my neighbours are technically savvy and mischievous. This is probably no different from using Wi-Fi.
 With apparent disagreement here