The main reason is that digital computers are so incredibly, overwhelmingly more flexible than analog. Analog computers are (generally) bespoke single-purpose devices. It really isn't too far off to imagine analog computers as code made physical, with all that entails.
Imagine writing a program if every time you wanted to change something you had to cut a new gear, or design a new mechanism, or build a new circuit. Imagine the sheer complexity of debugging a system if instead of inspecting memory, you have to disassemble the machine and inspect the exact rotation of hundreds of gears.
Analog computing truthfully doesn't have enough advantages to outweigh the advantage of digital: you have one truly universal machine that can perform any conceivable computation with nothing but pure information as input. Your application is a bunch of binary information instead of a delicate machine weighing tens to hundreds of pounds.
Analog computing is just too impractical for too little benefit. The extra precision and speed is almost never enough to be worth the exorbitant cost and complexity.
Imagine writing a program if every time you wanted to change something you had to cut a new gear, or design a new mechanism, or build a new circuit. Imagine the sheer complexity of debugging a system if instead of inspecting memory, you have to disassemble the machine and inspect the exact rotation of hundreds of gears.
Analog computing truthfully doesn't have enough advantages to outweigh the advantage of digital: you have one truly universal machine that can perform any conceivable computation with nothing but pure information as input. Your application is a bunch of binary information instead of a delicate machine weighing tens to hundreds of pounds.
Analog computing is just too impractical for too little benefit. The extra precision and speed is almost never enough to be worth the exorbitant cost and complexity.