this is better

ansible.cfg

@@ -2,3 +2,4 @@
 inventory = inventory.yml
 private_key_file = ~/.ssh/default-key
 host_key_checking = False
+interpreter_python = auto_silent

playbooks/systemd.yml

@@ -14,13 +14,12 @@
       prompt: "State of service"
       private: no
   tasks:
-    - name: Check if service exists
-      shell: systemctl list-units --type=service --all | grep -o "{{ service }}"
-      register: status
-      ignore_errors: true
-    - name: Change state of service
-      systemd:
+    - name: Gather service facts
+      ansible.builtin.service_facts:
+
+    - name: Manage service if present
+      ansible.builtin.systemd:
         name: "{{ service }}"
-        enabled: "{{ enable }}"
+        enabled: "{{ enable | bool }}"
         state: "{{ state }}"
-      when:  status.stdout == "{{ service }}"
+      when: service in ansible_facts.services