Por que o C # (ou .NET) não deveria nos permitir colocar um método estático / compartilhado dentro de uma interface?

aparentemente duplicado deAqui. mas minha ideia é um pouco diferente, eu só quero colocar um ajudante para meus plugins (interface)

não deveria C # pelo menos permitir essa idéia?

namespace MycComponent
{

    public interface ITaskPlugin : ITaskInfo
    {
        string Description { get; }
        string MenuTree { get; }
        string MenuCaption { get; }

        void ShowTask(Form parentForm);
        void ShowTask(Form parentForm, Dictionary<string, object> pkColumns);

        ShowTaskNewDelegate ShowTaskNew { set; get; }
        ShowTaskOpenDelegate ShowTaskOpen { set; get; }        

        // would not compile with this:
        public static Dictionary<string, ITaskPlugin> GetPlugins(string directory)
        {

            var l = new Dictionary<string, ITaskPlugin>();

            foreach (string file in Directory.GetFiles(directory))
            {
                var fileInfo = new FileInfo(file);   
                if (fileInfo.Extension.Equals(".dll"))
                {
                    Assembly asm = Assembly.LoadFile(file);       
                    foreach (Type asmType in asm.GetTypes())
                    {

                        if (asmType.GetInterface("MycComponent.ITaskPlugin") != null)
                        {
                            var plugIn = (ITaskPlugin)Activator.CreateInstance(asmType);
                            l.Add(plugIn.TaskName, plugIn);
                        }

                    }


                }
            }

            return l;
        } // GetPlugins.  would not compile inside an interface
    }



    /* because of the error above, I am compelled to 
       put the helper method in a new class. a bit overkill when the method should
       be closely coupled to what it is implementing */
    public static class ITaskPluginHelper
    {
        public static Dictionary<string, ITaskPlugin> GetPlugins(string directory)
        {

            var l = new Dictionary<string, ITaskPlugin>();

            foreach (string file in Directory.GetFiles(directory))
            {
                var fileInfo = new FileInfo(file);   
                if (fileInfo.Extension.Equals(".dll"))
                {
                    Assembly asm = Assembly.LoadFile(file);       
                    foreach (Type asmType in asm.GetTypes())
                    {

                        if (asmType.GetInterface("MycComponent.ITaskPlugin") != null)
                        {
                            var plugIn = (ITaskPlugin)Activator.CreateInstance(asmType);
                            l.Add(plugIn.TaskName, plugIn);
                        }

                    }


                }
            }

            return l;
        } // GetPlugins    
    } // ITaskPluginHelper
}