diff --git a/Library/Homebrew/extend/os/mac/diagnostic.rb b/Library/Homebrew/extend/os/mac/diagnostic.rb
index 0ab30c6563..d433127500 100644
--- a/Library/Homebrew/extend/os/mac/diagnostic.rb
+++ b/Library/Homebrew/extend/os/mac/diagnostic.rb
@@ -11,7 +11,6 @@ module Homebrew
           check_xcode_license_approved
           check_xcode_up_to_date
           check_clt_up_to_date
-          check_for_other_package_managers
         ].freeze
       end
 
@@ -136,21 +135,6 @@ module Homebrew
         EOS
       end
 
-      def check_for_other_package_managers
-        ponk = MacOS.macports_or_fink
-        return if ponk.empty?
-
-        <<~EOS
-          You have MacPorts or Fink installed:
-            #{ponk.join(", ")}
-
-          This can cause trouble. You don't have to uninstall them, but you may want to
-          temporarily move them out of the way, e.g.
-
-            sudo mv /opt/local ~/macports
-        EOS
-      end
-
       def check_ruby_version
         ruby_version = "2.3.7"
         return if RUBY_VERSION == ruby_version
@@ -200,19 +184,6 @@ module Homebrew
         EOS
       end
 
-      def check_for_bad_curl
-        return unless MacOS.version <= "10.8"
-        return if Formula["curl"].installed?
-
-        <<~EOS
-          The system curl on 10.8 and below is often incapable of supporting
-          modern secure connections & will fail on fetching formulae.
-
-          We recommend you:
-            brew install curl
-        EOS
-      end
-
       def check_xcode_license_approved
         # If the user installs Xcode-only, they have to approve the
         # license or no "xc*" tool will work.
@@ -236,18 +207,6 @@ module Homebrew
         EOS
       end
 
-      def check_for_beta_xquartz
-        return unless MacOS::XQuartz.version.to_s.include?("beta")
-
-        <<~EOS
-          The following beta release of XQuartz is installed: #{MacOS::XQuartz.version}
-
-          XQuartz beta releases include address sanitization, and do not work with
-          all software; notably, wine will not work with beta releases of XQuartz.
-          We recommend only installing stable releases of XQuartz.
-        EOS
-      end
-
       def check_filesystem_case_sensitive
         dirs_to_check = [
           HOMEBREW_PREFIX,
diff --git a/Library/Homebrew/test/os/mac/diagnostic_spec.rb b/Library/Homebrew/test/os/mac/diagnostic_spec.rb
index b4a7ecc1bd..91a94eb892 100644
--- a/Library/Homebrew/test/os/mac/diagnostic_spec.rb
+++ b/Library/Homebrew/test/os/mac/diagnostic_spec.rb
@@ -1,12 +1,6 @@
 require "diagnostic"
 
 describe Homebrew::Diagnostic::Checks do
-  specify "#check_for_other_package_managers" do
-    allow(MacOS).to receive(:macports_or_fink).and_return(["fink"])
-    expect(subject.check_for_other_package_managers)
-      .to match("You have MacPorts or Fink installed:")
-  end
-
   specify "#check_for_unsupported_macos" do
     ENV.delete("HOMEBREW_DEVELOPER")
     allow(OS::Mac).to receive(:prerelease?).and_return(true)
@@ -15,13 +9,6 @@ describe Homebrew::Diagnostic::Checks do
       .to match("We do not provide support for this pre-release version.")
   end
 
-  specify "#check_for_beta_xquartz" do
-    allow(MacOS::XQuartz).to receive(:version).and_return("2.7.10_beta2")
-
-    expect(subject.check_for_beta_xquartz)
-      .to match("The following beta release of XQuartz is installed: 2.7.10_beta2")
-  end
-
   specify "#check_if_xcode_needs_clt_installed" do
     allow(MacOS).to receive(:version).and_return(OS::Mac::Version.new("10.11"))
     allow(MacOS::Xcode).to receive(:installed?).and_return(true)