First of all. you have to give Carl a WELL DONE for his terrific role in Caddyshack.
I too have been in the green industry for many years...oh let's see....19 years...crap I'm getting old

. Having grown literally millions of plants, I can safely say that certainly for my business interests, I would never use compost as a soil source. There are just too many variables, and as Carl posted, unless you can do your own analysis on the compost...it's makeup is unknown to you.
I have been running a compost setup for many years, but only use it in my personal vegetable gardens. By tilling the compost into my native soils I reach a happy medium of stability and enrichment. Of course once mixed into my site, I let it sit for at least a month before planting any seed.
Weed...... I have access to professional grade soil at a wholesale price since I never buy less than 25 yards at a time, soil which has been analyzed and nudged into growing perfection. I can order any fert compilation I want to be mixed in with it, but I usually only have them add micro nutrients as I use containers and add my different fert mix on the fly while planting.
Organic fert vs commercial fert. I know a lot of people think there's a HUGE difference to the plant on whether the fert is organic or non organic. There isn't..... Are all commercial fert's the same? heck no.... the stuff you get at Wal-Fart etc. is the lowest grade available and it will work but not nearly as well as the stuff I use and probably Carl as well. The plant does not give one whit whether the origin is naturally induced or chemically induced....nitrogen is nitrogen, no matter the origin. Organics will feed over a time compared to Wal-fart fert's..... however again, if you step up to
nursery grade professional time relesed fert's....no organic fert can match it...
NONE. Certainly not on the basis of cost and convenience.
Now I don't know Carl, except for his fantastic rendition of Gopher love with a rubber hose....but he's pretty accurate in what he posted.
If you are going to use home made compost for a grow....let it sit on the grow site for at least a month or more. I would not reccommend growing with 100% home made compost if you want a PERFECT grow. Mix and sit...mix and sit....then plant.
out.
