@Jake M
I am sorry, but I have to take issue with that blanket statement. I have, from day one, used carbide insert tooling with my 7x and continue to do so. I have turned mulitple different materials,
all of it under 1000rpm (mainly 400 - 600rpm) and never had a problem with the inserts or the ability to turn anything, including 316 stainless. I also use cutting depths from a half thou' through to 118 thou', hand feeding the deeper cuts.
Sure, push people away from carbide if you have a valid reason like expense or that person is brand new to turning and would likely be frustrated if they kept breaking inserts whilst trying to turn something, but do not knock carbide on a machine that has been proven to handle it.
In fact, I would go so far as to caution anyone brand new to using a lathe to be aware that yes, carbide tooling has its place, but research and understand is required before buying into it. Learning basic turning with HSS tooling first is a good idea as is learning to grind and hone HSS tools.
Personally, I was taught the "Stone "n" Hone" method once I had learnt the basics of HSS tool grinding. Id-Est, grind the tool on a grinder stone, then hone (polish) it on an oil stone.