Use of Blogger includes various activities.
- Moderate Blogger hosted comments.
- Post comments, as a blog reader.
- Edit, preview, and publish posts.
- View Stats.
- Use the Template Designer.
As Blogger implies, both cookies and scripts are vulnerable to being disabled (turned off) - although the term "turned on" suggests that there is one single setting, possibly affecting each individual cookie or script. Considering the effects of layered security, we know this won't always be true.
Layered security can include settings in multiple components.
- Native browser settings.
- Various browser add-ons, extensions, and plugins.
- Security accessories, installed on the computer, outside the browser.
- Network appliances, installed outside the computer.
Filters are serial in nature. If any one filter blocks a necessary cookie or script, that cookie or script becomes unavailable to the Blogger feature in question.
- You can't moderate Blogger hosted comments.
- You can't publish a comment.
- You can't publish a post (use Preview).
- You can't view Stats (or exclude your own pageviews).
- You can't use the Template Designer (or Live Preview).
As noted several times, just because it worked yesterday, that does not mean that it will work today. Every filter is subject to update, by its creator. And both BlogSpot published blogs, and non BlogSpot published blogs, are subject to different, and ever changing filters.