I add about 100-150 new URLs a week to this site and for a very long time I was able to submit the URLs one but one from beginning to end without incident.
It takes a while so put on a good podcast or something, get yourself dialed in and sit back and submit them and you will get very good results from Google search - often within minutes after submitting.
This is important since my competitors are getting the same data feeds I am and I want to show up in the search ahead of them.
Then months ago something changed and I could only do 50 a day so had to spread out the manual submits over 2 days which was not too bad but I got it done.
Now I can only do a few a day.
If you want new URLs to show up quickly and favorably submit them and request indexing one by one by hand.
If you want to wait days/weeks and often never for URLs to show up in Google search while your competitors are showing up ahead of you wait for Google to digest your sitemap.
My sitemap has 50,000+ URLs for Google to look at and I can't wait for that to happen.
If the tool was for troubleshooting why is there a message that says Page changed? Request Indexing.
The Help says "Request indexing for a URL: You can request that an URL be crawled (or recrawled) by Google."
It says nothing about troubleshooting.
I know what works and I will keep doing what works and may have found a solution/workaround but since I'm not supposed to be doing that I'll keep that idea to myself.
I now see other topics in the community about this new issue of not being able to do more than a few a day lately.
I don't care if it is recommended or not. I should do it another way like a sitemap? Fat chance on that working in minutes like I'm used to.
I've seen things in the sitemap never show up in a Google search, but if I manually submit them they show up almost instantly.
I go with what works.