I agree with the views. One must sell when one makes reasonable profits. One should not regret if price goes up further after one has sold after making reasonable profits. After all a person who has the courage to enter at higher levels must also have his rewards. Similarly, 'Stop Loss' theory is for day traders. If the Company is good and you haven't borrowed funds to invest, you must remain invested.
However, a word of caution. One must learn to book losses. If the company you invest in is not good but share prices have gone up on mere speculation, you must learn to book losses when the share price starts falling.
Finally, 'Technicals' or no 'Technicals', 'Fundamentals' will always prevail. To enjoy the fruits of investing in a fundamentally strong company, one needs patience. This is for investors and not for speculators or day traders.
