Should only BootstrapException be exposed?

Dalamud.Bootstrap/BootstrapException.cs

@@ -4,9 +4,9 @@ using System.ComponentModel;
 namespace Dalamud.Bootstrap
 {
     /// <summary>
-    /// An error that is thrown when bootstraping Dalamud failed.
+    /// An error that is thrown when there was a problem with bootstraping.
     /// </summary>
-    public class BootstrapException : Exception
+    public sealed class BootstrapException : Exception
     {
         internal BootstrapException() : base() { }
 

Dalamud.Bootstrap/Bootstrapper.cs

@@ -8,7 +8,7 @@ using Dalamud.Bootstrap.SqexArg;
 
 namespace Dalamud.Bootstrap
 {
-    public class Bootstrapper
+    public sealed class Bootstrapper
     {
         private readonly BootstrapperOptions m_options;
 

Dalamud.Bootstrap/BootstrapperOptions.cs

@@ -3,7 +3,7 @@ using System.IO;
 
 namespace Dalamud.Bootstrap
 {
-    public class BootstrapperOptions
+    public sealed class BootstrapperOptions
     {
         public static BootstrapperOptions Default => new BootstrapperOptions
         {

Dalamud.Bootstrap/SqexArg/SqexArgException.cs

@@ -2,7 +2,7 @@ using System;
 
 namespace Dalamud.Bootstrap.SqexArg
 {    
-    public class SqexArgException : Exception
+    internal sealed class SqexArgException : Exception
     {
         public SqexArgException() { }
         public SqexArgException(string message) : base(message) { }

Dalamud.Bootstrap/Windows/ProcessException.cs

@@ -6,7 +6,7 @@ namespace Dalamud.Bootstrap.Windows
     /// <summary>
     /// An exception that is thrown when there was an error while interacting with the process.
     /// </summary>
-    public class ProcessException : Exception
+    internal sealed class ProcessException : Exception
     {
         public uint Pid { get; }