There's a lot to unpick here.
Firstly, people who make different value judgements to you about risks and benefits are not being dicks, just as people who feel more comfortable not socialising indoors and want to wear masks in public spaces aren't either. Any public health messaging or policies starting from that perspective will be at best a waste of time.
Additionally, if you want to talk about risk management, you can't only pick the ones you like. So if you want people to be told they should stay in when they have minor symptoms, that means acknowledging that this will be used as a tool of coercive control by some abusers, and that some people will be told they shouldn't be in public spaces by others, as a consequence of the messaging. These will disproprortionately be people who are already vulnerable in some way, because for all the comments on here about tutting at people who weren't wearing masks, got too close etc, people don't do that if they think it's going to get them slapped. They go for the easy targets.
Ultimately, you can if you like just tell people they should be doing X and Y. Sure. It's an option. But three and a half years into a pandemic, and having observed the failure in real world conditions of some of the provisions you mention, it's going to fall on a lot of deaf ears. You don't have to like that for it to be true. Meanwhile, those resources could be used for something we know would actually help like better sick pay.