I have a strong feeling that this ecosystem is a lot like VHS vs Betamax, HDDVD vs BluRay, and in the end someone will have to win out. I’ve not yet heard a valid business justification to create a two-way mesh device bridge, which is certainly a daunting task since every device intentionally obfuscates their protocols and message structure to inhibit interoperability so they can stay competitive. I think it would be trivial to make a smartphone app that connects to multiple devices and translates between them all, but I wouldn’t be surprised if that’s explicitly banned in their respective ToS, but who reads those anyway…
Even in the ham radio and two-way radio world, you have competitive standards…P25, DMR, Trbo, Tetra; D-Star and YSF, among others. These too are a massive challenge to interoperate because manufactures have chosen not to standardize and there is a surprisingly low number of people interested in buy into this idea, causing prices to balloon.