That's is not a bad thing. Japan is showing they will allow companies to legally offer services of crypto storages and other aspects. Cryptos need to become a legally business
It was probably a good thing imo. Sure, this means more control by the government, but that's inevitable if people want to use centralized exchange where there's a huge risk of hacking and so on. Limiting margin trading is also a good idea as some people are way too greedy sometimes. Like it or not, limiting margin trading would decrease the risk of loss exposure for those users. Hopefully, more positive adoption will come.
Regulation is not bad on itself and it is depending on the kind of government that is regulating it and what are the main intentions for such legalities. With the intention of making the field fairer and to protect the investors, I believe that the government of Japan can be trusted and is in fact a big pioneer on this aspect. There is nothing wrong with enacting laws regulating the use, trade and many areas surrounding cryptocurrency or what this said as "cryptographic assets" making things clearer or more defined. Let's hope that the same thing can happen in other countries like Russia, India and China (where ban is still in effect).