Developers issue
I have questions why apple developers not make normal sms to show delivery report on messages app because some people not using iMessage
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You're not addressing Apple here. This is a user to user tech support forum and we, just users like you, are not aware of Apple decisions/plans.
That said, if you'd like, submit your request/suggestion to Apple directly, using this link:--> Apple – Product Feedback - iPhone
Regards
Giulio