You appear to be arguing that even if microplastics are present in the environment it's not a problem. That's a brave stance to take given the wealth of information to the contrary.
Even if they did break down it's bad. Plastics have additives in them which are used to improve their material properties. These additives include BPA and PFAS (and similar). We know that these compounds cause problems in humans and the environment. So if they were "easily digestible by the body" that would absolutely be a big problem.
There's no world in which "nothing will be harmed" by plastic decaying. Some people even argue that conventional plastics are less dangerous in landfill than bioplastics because at least they don't release dangerous by-products like microplastics or "forever chemicals".
Despite claims to the contrary, PLA does usually break down into microplastics. It's possible that under certain conditions (such as those found in industrial composters) those microplastics might be broken down into starches and consumed by bacteria, but most teabags will just end up in landfill and won't break down beyond microplastics.
Kaliningrad's fairly strategically useless to them now that every surrounding country's NATO though. The Suwałki Gap between Kaliningrad and Belarus used to be pivotal in potentially re-taking control of Lithuania, Latvia and Estonia. It would have been very difficult for NATO defend them if Russia took the gap. But now those countries are protected by NATO countries all around so Kaliningrad's a lot less useful strategically. Not to mention that there's a strong Kaliningrad independence movement so they're struggling to control it internally as well.
And the energy used and pollution created in depolymerising and remanufacturing plastic is higher than the cost of just making new plastic. So there's not really much environmental motivation to do so, or it's a mixed bag at best. Less landfill, more pollution.
And the big secret is that plastic recycling happens much, much less often than you think. In Australia less than 10% of what gets collected for recycling is actually recycled. It's similar in other countries.
The STM32WB55 in the flipper has a versatile wireless peripheral built in which can be used to implement various protocols including Bluetooth, zigbee, etc.. Support for I2C, I2S and CAN is pretty standard stuff - the ESP32 is nothing special in these respects.
Maybe they chose the STM32WB55 because its wireless support is more flexible than the ESP32 and allows them to implement a wider variety of protocols? Or possibly just better documented, giving them the chance to do things they can't on the ESP32? I haven't compared the inner workings of the two chips' wireless support so I can't say for sure.
The ESP32s are nice chips, but the STM32s are also really nice to work with and will work fine for this task. Changing to an ESP32 wouldn't make any real difference to the user so the choice is moot really.
I've designed products around both CPUs and they're both pretty nice. The STM32 has somewhat better documentation, has cleaner low power modes and is a bit simpler when delving into the nitty gritty details. The ESP is more powerful and has some nice if complex features but I don't like its low power handling as much.
Overall I think I'd choose the STM32 for this task since it's a little easier to make small, battery powered devices with it.
I mean you're talking about the guy who allowed a million Americans to die unnecessarily through his mishandling of covid so I don't think a few deaths are going to bother him.
I guess it's more about the "limits biometric identification" part of the title.