That's a really good article. I was surprised it was from 3 yrs ago. I wonder how many of these firms are still operating. I enquired about the OLCI course probably about that time but thankfully decided it wasn't worth it.
But back to tiling. I did a short course probably about 7 yrs ago ish. And it was pants!! Absolute rubbish. They didn't even show me how to tile around a window!! Looking back i can't believe how bad it was. It only focused on ceramics , but i'm not sure how much porcelain was around then, let alone stone! If i remember rightly, they hardly mentioned the various types of adhesive available!
From what i have seen recently from firms offering 2/3/4 week courses they are now much more detailed with a lot of tuition about prep and different tile types to reflect what is in the marketplace thesedays.
I have had to learn as i go, teaching myself and researching what i'm dealing with and learning off others. I think it helped that i am a practical person to start with. But i know for sure that there is lots i don't know, probably stuff i could have only learned from apprenticeship (officially) or at the very least working alongside a time served tiler for a couple of years.
That said, i have managed to make a living out of tiling, although not as successful as i really need it to be, have a good reputation and dont have the "couldn't care less" attitude of the cowboy brigade.