^^^what lynnieb said!
i've had to switch up my products and reggie 3 times - that's almost every year! as hair grows out it takes on different needs... ESPECIALLY the ends. you have to understand, the ends keep getting older and have more wear and tear on them (combing, styling, etc.). so a light moisturizer that worked last year, might not be enough this year as your ends are "thirstier." (speaking from my own experience
)
i am a PJ at heart so i'm CONSTANTLY experimenting. some things i've found to be "too moisturizing" in the past might be exactly what i need in the future. shoot i never really needed protein treatments before this past year, but all that co-washing was making my hair mushy and causing my ends to split. i am dreading this upcoming year because now my shrunken hair touches my shoulders - i'm probably gonna have to switch from loose hair to protective styles. but this gives me an excuse to rock more cute braid styles and buy more fake hair (phony ponies, wigs, falls, etc.).