Earlier quoted context omitted.
I think this is a strawman argument. Can't it be the users from group#3 who's sad to see Signal turn into WeChat? After all the lessons learned from Keybase are open for all to see. WhatsApp doesn't include payment mechanism in many markets, why is Signal trying to waste developer resources on unwanted features?
WhatsApp payments isn't available yet in all markets, but you can be sure it's coming.
Src.: https://faq.whatsapp.com/general/payments/learn-more-about-p...
Therefore I'd argue that this specific feature can hardly be seen as waiting for a global rollout.