Why does the majority of your post read like you don't know these exist? https://en.wikipedia.org/wiki/Coaxial_power_connector
They're fine, but as you mentioned in the first paragraph, lack of a standard is their main drawback. You could find two power supplies with the exact same connector but different voltage and polarity.
Why does the majority of your post read like you don't know these exist? https://en.wikipedia.org/wiki/Coaxial_power_connector
They're fine, but as you mentioned in the first paragraph, lack of a standard is their main drawback. You could find two power supplies with the exact same connector but different voltage and polarity.