Is directory submission spamming activity in the current competitive environment?
If hundreds of links are placed on directories within 1 day, I think search engines will see this as spamming.
I think there is nothing wrong with links coming in from directories. As long as it doesn't become overpowering.
If your site only depends on directories and bad backlink pages, it won't do you any good.
Always provide an extensive link profile with different sites. A portion from directories will not immediately damage your ranking.
Proper directory submission practices should be a part of every SEO.