Please enable app permission to sendMessage to user

Please enable app permission to sendMessage to user
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 Aug 05 2021
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need to create an app to send notification to users without having to create a bot framework solution. Currently this API only allows delegated access to send message to a certain user, is it possible to extend this API so the app can send message to users?

Slack got this API called chat.postMessage and I can easily just register an app and call their API to send message to any user within the tenant as long the app is approved and installed on their tenant. Why can't we achieve this using graph API?
https://api.slack.com/methods/chat.postMessage