And really those issues should be solved at the browser level not the OS level level that affects every single application that runs on it. And AFAIK they already are.
I do not want my compiler or game or renderer or whatever else to certainly become slower just because someone may visit a site that may have an infected ad that may match an exploit their browser may have and may manage to extract some information that may be useful for whoever wrote the exploit (assuming they even manage to get that info back).
Also a cryptominer will only work for as long as you have the site open, of all the things that could go wrong, this is the most benign one.