It could be argued that governance is better in other countries at least in part because there are more parties. After all, it enables alternative voices to be represented better, and it reduces the power of centralised party structures.

On the other hand, too many parties becomes unwieldy, and I'd argue that 10 is already going to be too many in practice.

Historical experience in the early 20th century led many countries to develop minimum bars, e.g. parties with fewer than 5% of the vote not getting any seats in parliament.