If this is clickbait, you are a google shill. The limitations of v3 are very clearly explained on the ublock homepage:

uBlock Origin used the webRequest API to intercept and block network requests in real-time. The replacement declarativeNetRequest API has hard limits on the number of filter rules (previously 30,000, now 330,000) and lacks the dynamic filtering capabilities that made uBlock Origin so effective.

    Cannot use all filter lists simultaneously (rule limits apply)
    No cosmetic filtering in the default mode
    No scriptlet injection by default
    Limited dynamic filtering capabilities
    Requires broader host permissions upfront