"Technical traders...... What they don't tell you is; 1) they...

"Technical traders...... What they don't tell you is; 1) they buy in after an uptrend is already underway "

Correct trick is to get in early in the trend . - But more importantly T/A can get you out early in a downtrend to preserve capital.

"they sell early based on a whimsical strategy"

Incorrect trading on a whimsical strategy is not trading its punting - whimsical traders dont survive. There are plenty of sound trailing stop strategies you can use to stay with the uptrend for as long as possible

"The winners should outpace the losers by some considerable margin"

Correct that applies to investors even more than traders !

"if you choose your 10 logically and spread the risk"

Applies to investors - Traders can successfully trade 1 or 2 stocks the risk management comes from not having any more than 5% or 10% of your account at risk on any single trade