Turntable Speed


Hello Forum, I'm getting back into record listening after a long hiatus. Please forgive the naive question, but here it is.  My former 1981 turntable had a speed control with the little window where you could fine-tune the speed if it was a little off. I've noticed current turntables don't have that. Reasons?
Thank you. 
tgyeti
@edcyn:

If the speed is way off, you should maybe buy another turntable with speed adjustment possibility. 
@ibjunkman:

I have never tried it on 78. Your iPhone would probably stay unharmed and on the platter if you laid it close to the center of the platter.

I really don´t understand your objection- would you rather not know if your turntable speed is way off?
The RPM app is just a simple and reliable way of knowing if your turntable operates at the right speed.
What could possibly be wrong with that? IMO it´s a basic parameter when playing vinyl.