RCS is a non-starter if you need to do group chats with iPhone users or send them pictures without a massive loss in quality, as iPhones do not support RCS. As long as Apple refuses to support it, it will continue being a terrible choice in any country with significant Apple user base. An Android user with WhatsApp shares an identical experience with an iPhone user with WhatsApp. RCS on the other hand will drop you back to what cell phone messaging was many decades ago.
[1] https://www.statista.com/statistics/1311229/whatsapp-usage-m...
Edit: A quick search said this from the same source:
>Using WhatsApp less often than once a month was the most common usage frequency among Danes in 2019, according to 23 percent of the service users. 15 percent used the app weekly and 13 percent used it several times a day.