Agreed. I choose not to use Apple products for my own reasons, and it's frustrating that Apple refuses to let people into their iMessage garden while also refusing to implement open chat standards. RCS is far from perfect, but it's a hell of a lot better than SMS, and even can support end-to-end encryption now.

Speaking of iMessage... that's already a thing, and it's already an Apple-only chat platform. Not sure what Tact brings to the world if it's also Apple-only. Based on OP's description (looks like it's pinned as the first comment and can't be replied to), Tact seems like "iMessage, but not as good".

Disagree. Pixelmator is awesome, huge cottage industry of niche MacOS app and marketshare of Windows+Linux much bigger for the “less fortunate” to choose from.

Might be tricker for a chat app tho…