I was just thinking about brand label baits, and wishing Gambler makes a pearl ez swimmer with red eyes type of thing. I think a buddy I used to fish with used the hand pours you mentioned, everyone in Florida uses Bitters which is not a secret, and we have secret colors on each lake, but those colors are good in all lakes with same color water.
I don't believe in secret colors or absolutes in fishing, too many variables, and if I found a true secret lure or color, it is not staying a secret, it is becoming a huge lure on the market. I have my own secret colors I find work best, but I also found out I was not the only one having changeovers done, in same styles, and we always talk and share....I know color matters, but only if in the right hands, right time, and that window could be 2 hours from my experiences. Only rare, but hand pours are awesome, great action, plus I get them to fit my style so I am more confident. I use a hypothosis based on local knowledge, water color, depth, good polorized glasses, and usually when I slay em on a certain color that is a hand pour that I "created" I find that someone at the ramp did 2x better using a 5" Kalins Grub in Lime with a Pink tail on a 3/8 Mushroom jig with a fast but stop and go retrieve to kill them....for first 2 hours of day, then they had a few on a jig, but those 22 lbs were good enough, right time right place has always been my theory, but fishing is not fun if we have nothing new to try or if you don't try new ideas.....Powerbait had science-Berkley Institute, and when I read about fishing, it is usually skill that made the guy who win, was on pattern long enough, didnt lose the big ones....If they have money, some guys win alot of big events cause they can pay locals for maps, pay them to pre-fish during the week, I have noticed and heard lakes get really crowded before big events....
Either way, I think some companies make such good quality soft baits that hand pours are still awesome, its a custom so you can do it your way, but I have not been able to find anyone to duplicate the action of certain brands....Kind of wish I could get Yamamoto to make some senkos in Roboworm patterns....May happen, trends are moving in a few new directions for sure...Always more good stuff to buy, tackle has gotten so good in my 30 years, I look at old BP catalogs and see the lures and names and color and it just shows that your statement of "lakes change over time is 100% accurate, Senkos seem to be not as popular in this area any more, guys fishing more creatures, finesse, or just read the last 6 major magazines and that is usually what most guys are throwing in some form.