Sharkstar-
At least it was a carpenter rather than a doctor
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Most carpenters wouldn't do it the way you have because they'd be starting from scratch. The main issue you normally encounter is finding straight material for the rails. MDF sometimes warps when you glue it up with the panels in especially with floor to ceiling doors. It used to be quite popular to use pine for the rails as you can then use normal hinges without them pulling out over time.
The more I think about it the more it makes me think he had a point. If you try to make them quickly on site there are definitely issues that can result in warped doors etc. Your method is pretty reasonable and without too much risk but most carpenters would worry about delamination of the thin mdf.
I've made a few 8ft doors panelled in MDF but used thicker mdf rails and still had a few mm deflection in the middle which is annoying but near impossible to avoid or fix. Now I try to design cupboards with smaller doors but there are times when that's not what the customer wants.
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Howard
Airhead
Will be fun fixing that up