My understanding:

Before: Need $50k in bank, register business, sponsor yourself for a visa

Result - lots of people just abusing the system for a visa

After: Need $300k, must hire at least one local, must show a profit of $200k within 2 years. Must be reviewed by the government multiple times a year to show your business is serious

I can see some issues. If you want to start a company that requires a year or more of R&D before you can ship you're S.O.L.

Why should Japan allow $30k? Doesn't make sense.

I had a friend who was looking to move to Japan and abuse this visa. The business was only there to get the visa with no intention of operating it.

I'm not Japanese and I don't live in Japan but even I think this new law makes more sense than previous.