This is taken from MSDN forum.
https://social.msdn.microsoft.com/Forums/vstudio/en-US/442b100a-2b88-4ac4-b655-0c1345791f15/roslyn-cscexe-web-api-2-on-hosting-server?forum=msbuild
I have noticed a minor drawback to uninstalling this package:
https://www.nuget.org/packages/Microsoft.CodeDom.Providers.DotNetCompilerPlatform
Some of the new C# 6.0 language features if used in Views (MVC
project) will not compile. Many of my views use the ?. null
checking operator for accessing Model properties. All of these views
now return errors on my Godaddy hosted MVC 5 application.This error occurs because Views (by default) are compiled at runtime
using the .NET pipeline (not pre-compiled).To resolve this issue, simply uncheck the “Allow precompiled site to
be updatable” option in your publish profile settings. This should
pre-compile your views and allow your C# 6.0 (Latest version of Roslyn
Compiler) to run like a champ.
Just wanted anyone looking at this question to know the ramification of uninstalling it and why its there in the first place