My web application was on classic based authentication SharePoint 2010 web application. I was using a InfoPath form that contains userprofile webservice data connection, the form load rules were set to provide current logged in person to this web service and to to this i used userName() (InfoPath build in function) which provide login name of current logged in person, in classic based authentication it provide full login name with domain name while in claim based authentication it will provide login name without domain name.
SharePoint 2013 by default uses claim based authentication however we can create a classic based authenticated web application through management shell, my question is it would be very much troublesome for us to update 45 InfoPath form so if i create and use classic based authenticated web application in SharePoint 2013, would there be any issue?