My understanding is those flags are often ignored by the most prolific offenders, and they can even be used as identifiers. I am not an expert though, so maybe others will have more detailed answers.
this post was submitted on 18 Jul 2024
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You pretty much said it.
The reason these aren't ticked is that most people don't tick them, so you're sending websites more data than you would otherwise, and websites don't have to respect these requests at all.