Let me add a 7th problem not mentioned in the piece: the police can and will change passwords to cloud-based accounts for people from whom they’ve seized devices. In effect, those being investigated can and will be denied access to their own personal data, such as family photos etc.
Let me say that again. You may not have done or are even accused of doing anything. If you get snared in an investigation, your data and digital assets will be blocked by the state to find reasons to charge you.
(I’m a little more knowledgeable about the legal situation in Singapore. PDPA has a lot of teeth to enforce data privacy restrictions. But a lot of penalties pertain to private entities. I need to check on the situation with government bodies. Certainly, you can be compelled to produce your devices in an investigation. Whether you have a right to insist on cloning/ ensure provenance etc is something I need to check on.)