With all the technical innovation in how knives open now, having a push button do it is just another option.
One of the serious problems I have is that a full auto knife is twice the price of an assisted. Same materials workmanship fit and finish. What the law did - and it was the intent - is move ownership of auto knives into a privilege determined by your finances and social class. If you can afford one, and you have the intimate connections with the ruling class in your community - no problem. Compare that to the profiling that was endemic with the anti switchblade movement in the 1950's and which ones were pushed out of business.
It was simply a test phase for anti gun legislation and it worked.
I have Paragon, Benchmade, Schrade, Lightning and have had issue Camillus autos, they all work fine. The one that I carry daily as an EDC and find both fun and useful is my Ganzo 7212 stonewash in OD G10. It was less than $18 with free shipping, has milled stainless liners with bolsters one piece, smooth action and works great.
When you have a knife made well and costing less than the average FRN clamshell discount folder you have to ask why the $150 and up pricing for a "Brand" knife?
Now, why do I think that autos are overpriced? Take the Boker Top Lock - in the day it was a $49 folder, or a $99 auto. One $2.50 retail cost spring was the only difference.
Yes, the custom makers use a lot of exclusive and expensive materials, but for the most part we could be buying autos for $49 in a truly competitive market and getting Benchmade quality components. What we have is a protectionist setup with only American makers considered legal, MIL/LEO the only "qualified" buyers, and a lot of hypocrisy about "no Interstate trade."
So, of course they charge what the market will bear. Same as Broomhandle Mausers until the Chinese dumped 50,000 of theirs as surplus and that dropped the price to half. Being no longer in production prices eventually rose over twenty years back to their norm.
With new autos being made every day, I see the market as one that shuts out the common knife buyer and which isn't likely to change as the makers like things exactly they way they are.