Can we do the following to assign a custom master page to all the sites in the
site collection?

1. Write a feature, say Feature 1, to assign the master page in a particular
site to a custom master page.
2. Write a feature, say Feature 2, which uses "Feature Site Template
Association" to assign Feature 1 to all the site templates

When we install and enable Feature 1and Feature 2, will all the sites be
having the custom master page associated to them?

If this works, What are the advantages and disadvantages in using this kind of
methods?