Major safety issue in blocked contacts after upgrading to iOS27

This is a user to user forum, you are not addressing Apple here. You can voice your opinion in the link below -

Feedback - iPhone - Apple

Are you referring to the fact that iOS now tells you when you have exceeded the number of blocked contacts that it can handle?

From what I understand,

• iOS never supported blocking an unlimited number of people. It would appear to accept huge numbers (multiple thousands) of block entries, but past a certain point, would only enforce some of the blocks.
• It now gives you error messages if you exceed 3,000 blocked contacts.
• Blocking scammers and spammers with individual entries on your phone is a losing game of Whack-a-Mole – as many frequently change the numbers they call from, and/or use fake Caller IDs. There are a few spammers who may keep calling from the same number, allowing you to block them, but if you are playing the game of Whack-a-Mole, you really need to find a better solution. Like telling your phone to ask the reason why someone is calling, and/or sending calls that your carrier identifies as junk calls to voicemail.
• Once you stop playing Whack-a-Mole, it's unlikely that you'll need anywhere close to 3,000 blocked contacts.

This is neither a security issue nor is it leaving anyone vulnerable, it's simply an inconvenience.

You're being paranoid.

What is your read receipts setting?