why do some manufacturers still make analog oscilloscopes,
Analog scope have many advantages (of course also disadvantages)
With totally unknown signal one disadvantage with digital scopes is aliasing.
If look price and aliasing - well this is one reason. And only one. There is of course also many other reasons.
I have find in my work that sometimes need digital scope and some times still analog is very handy.
(of course I mean real (and old) professional analog scopes like Tek and HP)
In repair situations,a common procedure with an analog Oscilloscope is to:-
(1) Set the 'scope Vertical input to “DC coupled",& the triggering to “Auto”-----in this setting,the instrument will “free -run”,displaying a flat line on the screen without any input.(None of the DSOs I've ever used really had any equivalent to this function,as “Auto” was a completely different thing)
(2) Look at various parts of the circuit to determine the presence or otherwise,of the desired signal,dc power supplies,spurious signals,etc.
(At this point,proper triggering is not necessary)
(3)Trigger 'scope correctly on the signal of interest,for detailed examination.
A Tech may fault-find a piece of equipment without using any other instrument although,usually a DMM is used to verify the power supply voltages more exactly,before "closing everything up".
I found it was very hard to follow this procedure using a DSO,as the only way to look at a dc level seemed to be to put the 'scope in “roll”.
Even this didn't work well,as it displayed the voltage change as the probe was placed on the test point as a transition,which may or may not be on a visible part of the display.
No doubt,modern DSOs have overcome such limitations,but the early versions have left us “Greybeards” with a somewhat jaundiced view of such devices.
I was an early enthusiast for the idea of Digital Oscilloscopes,but the reality set me back on my heels!
Ultimately,"It's horses for courses".
If you are looking for a "runt" pulse in a pulse train,then the DSO is the obvious choice.
If you are not even sure if the pulse train is there,or if it is riding on a few volts of AC mains hum,I'd go for the analog Oscilloscope!