Which is better between: blog dot websitename dot com or websitename / blog -- It really doesn't matter from a search perspective too much, so I go with user-friendly, which is usually websitename / blog.
As far as keyword stuffing being good or bad goes, when you keyword stuff, what happens is you end up with stuffed keywords. Keywords don't really need to be stuffed for visitors, because people will "get" your page is about keywords stuffing without you stuffing it full of keywords if you just write naturally about keyword stuffing, rather than stuffing your keyword in any chance you get.
Search engines will also understand your keyword stuffing page is about keyword stuffing when you talk about keyword stuffing without actually keyword stuffing -- All keyword stuffing really does is provide a bad experience for visitors who try to read your keyword stuffed page about keyword stuffing, because keyword stuffing certainly won't help you rank these days and I didn't need to say keyword stuffing as many times as I stuffed the words keyword and stuffed or variations into these two paragraphs to answer your question about keyword stuffing, did I?
TL;DR Don't keyword stuff a page it worked 5+ years ago, but now it's silly to do.
LMAO! I was actually think my post could totally backfire just because this site carries so much weight on SEO topics and it's "fresh", so I'll just hope it doesn't -- Of course, the chances definitely increase if there's only two paragraphs of it on the page and the page gets some "traction" in the results.
Well, if you want to prove me wrong take a page on your site, or if you're risk adverse and not as confident as it seems, set up another domain and stuff it to the max, then let us know when you pass the other pages using the same techniques -- It should be rather simple if you're right and stuffing is what's actually causing them to rank.
I don't think the stuffed page can stand on its own without a blackhat crafted pyramid of onsite and offsite lateral links building up layers to the stuffed page. And as RedBar is suggesting some search engines are smarter than others at figuring that out.
The iceberg analogy applies well here. While google is studying the people going owwwwwww and ahhhhhhh looking at the iceberg bing probably sent their divers down with a string of 2000 tools to figure out what's keeping it afloat.