In my mind without any shadow of doubt he was The Greatest trainer of all time and the ONLY trainer who really could have a 100 horses in work at the same time and know every single one of them(even in the dark), one of the great advantages was his brothers Earnie and Dick were a great asset, trainers don't tell their staff much about training because they fear in a few years they will use anything they learn against them, with Family you can discuss everything and tell them everything they need to know, this is why family training setups work so well, I am sure it helped John Hawkes/ Peter Snowden/ and Lee Freedman when he had his brothers all there by his side, some think Earnie knew as much as Tommy, not true, Tommy was a genius and try as he might that is something you cannot teach
Still Tommy was a production line too and I am sure some horses don't suit that style of training, with a production line style most horses are worked the same and fed the same, with not much variation, it is if you can't stand the heat get out of the Kitchen kind of attitude, trouble is by the time these big stables are finished with them the horse is burnt out so no one else can get anything out of them either(of course there are exceptions to every rule) you can bet the attrition rate of these big stables would be horrendous, they don't pick up things like Bowed tendons until they are a grade 4 or 5 bow or both front tendons are bowed, I am afraid I don't think big stables are good for anyone in the industry except the big trainers, the main sufferers are the owners and unfortunately they don't even know how they are getting screwed, great if you are a big owner and have 100 horses in work ala Arab Sheiks or the Inghams etc you can afford a high attrition rate but the average owner doesn't have that luxury
P.S. I have had horses in work with a few of the big trainers(not Waller) and many of the smaller trainers and I can categorically say the service for both owner and horse was far better from the relatively small trainer(Like a Joe Pride or Brian Mayfield-Smith types) a lot of small trainers are small because they can't train but there are some that are small because they like it that way or are not good at promoting themselves
That is one reason why Joe has been able to turn many "sour" horses around, he has only about a 3rd of the horses in work that the major stables have which is the max that one person can truthfully train, Brian never let it get past about 25 horses in work so he had total control of all the horses, they are trainers, the others are more managerial they would spend as much time managing staff (and Owners) as they would training horses, still it is just my opinion on on what it takes to manage and train thoroughbreds, opinions are like bums, everyone has one