Espresso changes things quickly
You can use a manual grinder for espresso. Some models can go fine enough and have the adjustment range to get there.
Using one daily is different.
Espresso needs small changes. You grind, pull a shot, taste it, adjust, and repeat. That loop matters.
With an electric grinder, you stay in that loop. You make a small change, and the grinder responds immediately. Grinders like the Eureka Mignon range are built for this kind of use.
With a manual grinder, every adjustment comes with more effort. Most people stop adjusting earlier than they should. They settle for something close instead of getting it right.
If you’re planning to make espresso at home regularly, you’ll end up looking at electric grinders anyway.