Does Adding extra custom fields in Register form effects while updating plugin?

Hi, I have added extra fields in register form using links:-
https://wordpress.org/support/topic/adding-additional-registration-form-field and
https://www.jfarthing.com/development/theme-my-login/adding-extra-registration-fields/.

Right now, I am using wordpress 4.5 and Theme My Login 6.4.4 version.

But I have query:

Does customizing registration form in such a way will effects/disturbs all setup, if we will update this plugin in future? Is it safe solution from future point of view?

Any help will be appreciated.

https://wordpress.org/plugins/theme-my-login/