I seem to recall a set of DT Swiss XMM 140 forks I had on my first proper full suss. They had 140mm travel but could be stuck down at 110mm for climbing. IIRC they would release automatically if you bounced them hard meaning you couldn’t forget to unlock them for the descents.
I had some and they were lovely forks. Forgot to raise them for a descent, they didn’t blow off and then didn’t work as well afterwards! Still, they were the plushest pre modern Pike fork I ever had.
As for what happened to adjustable forks? Maybe something to do with us riding less do it all bikes and travel increasing? BITD 130mm bikes were allrounders, used for everything from XC to all mountain. These days 150mm+ is pretty standard where as XC bikes are still 100/120mm.
Have Rockshox made an adjustable version of their modern forks (post game changer Pike)? Before that the majority of people wanted Fox and I guess not enough people were buying TALAS so they stopped making them? Reviews saying the cheaper and lighter Float was the better fork can’t have helped.