Micro service number limit

[Gildas]

Hello,

We have 2 remote engines in a cluster, theses remote engines are configured for 50 micro services each : 
org.talend.ipaas.rt.dsrunner.cfg

# Limits the number of simultaneously running microservices.

# The maximum possible value is 50.

# Set value to 0 to disable microservice execution.

ms.running.instance.limit=50

But in the Talend documentation, this 50 services limit doesn't appear

Microservices

The number of deployed microservices is limited to 20 by default. To change it, see Customizing global microservice configuration.

• To change the limit of deployed microservices, edit the ms.running.instance.limit property.

I've made a test by increasing from 50 to 70 (theoretically out of bounds), but it's working !

My question : 
Microservices are executed in dedicated virtual machine, why is there a limit of 50 indicated in the conf file ?  
This limit should be drive by the serveur performance (UC and ram) and the execution profile use

Gildas