A few thoughts to consider
Google gives established sites a higher search ranking, so it's difficult for a person to stumble across a new domain by searching.
New sites are quite suspicious, and when people click in links in emails or are redirected to those sites, or get emails from that domain, that is a strong cause for suspicion.
Having a parked domain is not in itself suspicious. I bought one for my sole trader contractor business and was too busy to add content for 6 months.
Current events and new info is primarily going to come from news sites, social media etc. Updates to existing domains won't be affected, so there are minimal issues with blocking new domains. But examples will emerge if blocking based on time is implemented. One example could be a legitimate business registers a new domain for a marketing microsite (because why update an existing site with a strong Google ranking?). It is launched at the very last minute (probably by people working past midnight). If it was widely blocked for the remainder of the month since it was registered this would be a disaster for the company who commissioned it.
Google's approach of weighting established sites more highly, as one factor amongst many is probably the best.
And yes, scammers will adapt. The only permanent impact will be reduced agility to respond to events.
Biting the hand that feeds IT
