Programmable scanners must have seemed like manna from heaven to scanner guys who started with crystals,
Not initially.
The very first scanners, you didn't just put in the frequency, but had to do some sort of "magic" to get the entire frequency in, moving switches to positions.
Later on, when the "direct entry" mode was common, things changed. Some times they were only ten channel radios, but you left one channel open (more or less) to enter a frequency you wanted on the fly.
In hindsight, the crystal radios had their benefits.
The REAL benefit of direct entry came when some agencies went to, or were initially on, UHF frequencies. To be able to input a UHF frequency, as well as a VHF frequency, was a big deal.
But the real "change" came when you could actually listen to your local police and fire in your car! And that wasn't with a "scanner," but with a "converter," which you attached to your car's AM radio, by taking the car antenna and plugging it into the converter "box," and then another antenna cable to the car radio's antenna input. The converter was powered by a nine-volt battery. It was great, except for the fact that the first "converters" didn't have a squelch, forcing you to listen to the "static" and the car's motor unless the department was transmitting something. They later came with a squelch, as well as a duel-channel converter.
There was even a converter you could put back-to-back with a hand-held transistor AM radio, which, when tuned properly, could monitor the police/fire frequencies. But, again, no squelch. They were handy to have when you were riding your bicycle to fires.