Why do I need to report my residence for the TM30 if I've lived in the same place for years?

I've lived here in Bangkok for almost 10 years. I'm currently working for 5 years with WP/Visa at my school and living in the same town house since 2014. This is my 3rd house actually. I have done 90 days religiously and reported about the same address every time and when I come home to visit my relatives outside Thailand. I don't have any trouble extending/renewing my visa since then. But, with the things going on about this famous TM30. I have got so many questions.

1. Why do I need to report my residence within 24 hours upon arrival when I live in the same house for 5 years and didn't do anything like this before?

2. Why do minors or newborns have to pay 800 baht, too? (when they don't have visa yet)

3. For example: Me and my three girls went home for vacation and came back here and my partner stayed in Thailand, why do we have to pay 4,000 Baht (800 x 5 people)? My partner has his own work permit and visa.

4. Does this apply to all family members living in the house with or without visa, regardless of age?

5. Will this affect my 90 days report (in June 2019)?

What should I do? Please help. TIA.