That is an interesting question. I think that Canada is the only developed country with an immigration system that requires every application to be processed and decided upon.
I know that New Zealand, Australia, the United Kingdom, the United States and countries in Europe restrict the number of applications they process. I do not know why the previous government created a system with no limits on new applications. It made no sense.
In the United States, they use a lottery for new applications. In Australia and New Zealand, there is a processing period lasting several months for economic immigration applicants, whereas it is several years in Canada. That reflects the different policies in each country.