From what I’ve seen, the argon does passive-cool alright too. With Flirc I’d need to keep the mini-HDMI-dongle and buy a separate IR dongle, that takes up a usb-slot and doesn’t have a low-power MCU. My Pi is currently in a no-name passive-case already. Unless I misunderstood you, I don’t see the advantage.
An advantage of Tuta and Proton is, that there is a basic free tier. Your Mail is a center-point of your online activity. Hoping it to never happen, if you ever can’t afford the (cheap) price, you won’t lose access to your mail. Which would suck, for all accounts linked to it.