If you have fast internet you will probably not really notice the difference
The difference between v2 and v3 is that v3 will no longer allow uBlock to modify network calls. Previously one of the big savings of a adblocker is they can stop the calls from being made AT ALL. That means less tracking AND less of your internet bandwidth being used
Both v2 and v3 can block the actual elements from your screen so you will probably still not see most of the ads. But you will still be able to be tracked and your data will still be used in the background
V3 doesn't allow network calls to be modified, for privacy reasons. It still allows them to be blocked, which is how the adblocking works in the first place.
Contrary to what you say, v3 does block the tracking in the ad request as well as the bandwidth.
It only allows them to be blocked with static rulesets. And these rulesets have a maximum size of 50. There's no way this is large enough to cover all your websites. It's also trivial for an anti-adblock script to try a few different urls until it finds one that isn't in your static ruleset
I'm not well versed into adblocking, but shouldn't the extension also get access to the content of the request as well, to be able to either improve it's blocking accuracy (e.g. detect if the whitelisted content matches blocked content patterns) or decide to hide a resource after it was fetched ?
it's easy to see how people might say v3 is an adtech conspiracy. Ads are always served to the user now, expect a noticeable revenue increase by almost every adtech company.
The difference between v2 and v3 is that v3 will no longer allow uBlock to modify network calls. Previously one of the big savings of a adblocker is they can stop the calls from being made AT ALL. That means less tracking AND less of your internet bandwidth being used
Both v2 and v3 can block the actual elements from your screen so you will probably still not see most of the ads. But you will still be able to be tracked and your data will still be used in the background