This is an age old issue not just related to our industry, but for all trades for all times.
Even the greatest philosophers of ancient times engaged in similar debates, The Orientals came up with the best solution:
Learn all you can..from all sources. The true seeker of knowledge and wisdom doesn't limit oneself to only 1 master of 1 discipline, rather he studies under ALL MASTERS AND ALL DISCIPLINES. Then he formulates his own style that is best suited to him and his environment.
Yes, we all need basic class room "hands on" training for self defense, chemical sprays, handcuffing, bldg searches, etc. In fact in some states it is mandated by law that you be certified by a leo instructor in these facets of our industry before being allowed to work.
However, there is also a "textbook" side to our industry as well, just like any other field. We have to stay abreast of constantly changing laws, equipment, tactics, strategies, etc.
Also online courses can aid us in building a business: marketing strategies, contracts, building a clientelle and keeping those customers, etc. Scott Harrell has some of the best online courses that I have ever seen
www.bondforfeitures.com. I learned alot from him and I talk to him on a regular basis.
There is plenty of room for both venues, and the true professional considers all tools objectively before eliminating them.
Now, having said all of this, you do of course have to check the schools out to make sure they are professional and accepted.