ClickUp and Wrike offer this. It's very quick and easy and can be copied and pasted. Existing bullet lists can be converted to checkboxes and vice versa. Meanwhile I use the √ character (square root) which sort of works but is not at all convenient.

Checklists and Checklist Templates are def must-have features. Apps like Process.st and Metatask.io have these for workflow automation.

It would be cool to be able to integrate the checklists with documentation somehow, but maybe that's overkill.

Here's a simple example of this from Clickup which I would find useful: https://clickup.com/checklist-templates.

Subtasks can kind of work, but having dedicated checklists for processes helps streamline and automate operations so the whole organization runs more effectively and smoothly.

Even adding a checkbox as a type of bullet for a list would make it a little nicer. Subtasks are too much for things in a list like milk, eggs, etc. I think a list is a fundamental element for any organizational tool. It does not have to be linked to the progress - someone may choose to leave items checked when they don't need them and uncheck them when it is time to reorder for instance.

@Charles - you can collapse all subtasks and we do show not a progress bar but 3/5 which means 3 subtasks are completed from 5 existing.

Otherwise, system's becomes just unmanageable - you can have 5 subtasks and a bullet list attached to a task with 10 entries and now there is a need to show two progress bars etc.

I will keep this idea posted to see traction.

I get this - without thinking about how I should or shouldn't use the platform, I found myself putting most of the task's work in the title and then doing a bullet list as the only "contents" of the task.

The strikethrough idea is nice, but not automated or visible when the task isn't expanded.

For example, in list view, imagine you could had a "progress bar" for the task that correlated to the percentage of checklist items are completed. Would be very easy to see at a glance how much is done.

Alternately, maybe find a nicer way to show subtasks (collapse and replace with a progress bar)?

Add bullet list to task's description and use strikethrough to mark completed? :)
Cheers
Igor