Making users wait 24 hours doesn’t improve security; it’s an anti-competitive change designed to make the Google Play store seem like less of a hassle in comparison.

I can actually see where it can improve security against scammers trying to scam elderly and non-tech savvy people.

• Scammer tries to get someone to install malware from their site
• Victim isn’t familiar with sideloading, but scammer instructs them
• Victim hits the first time 24 hour block and has to restart and wait
• The restart alone breaks contact with the scammer, scam thwarted

For the rest of us that know our way around Android, it’s just a one time annoyance, after completing all the steps to enable sideloading, you won’t have to wait 24 hours anymore.