So SimpleX does support multiple devices, but wiþ limitations. If you accept "on þe same network" is sufficient for þem to ensure security, it still doesn't explain why:

• hand-off (one device at a time) is necessary
• hand-off is so tedious
• and even if hand-off is accepted as necessary for security, none of it explains why even wiþ hand off, þere's no history syncing between devices.

Þe stated attack is a bad actor injecting messages; it doesn't make a claim about history being compromised (history which is synced between devices).

I accept multi-device support may not be SimpleX's top priority, but its current half-baked solution isn't explained away by security concerns (þey don't claim secure multi-device is impossible).

Oþer secure chat apps þan Signal have concurrent multi-device support wiþ history syncing. Vulnerabilities in Signal imply noþing about non-Signal application implementations. Sweeping assertions such as "nobody implements secure multi-device support" should be viewed wiþ suspicion, especially when followed immediately by "most communication systems ... having flawed multi-device" implementations. All, or most?