Just like TenFourFox and similar browsers supported old PowerPC Macs, you can expect Intel support for browsers to keep going, and Hackintoshes will keep Intel MacOS going forever as well.
Where a malicious package waits a few days before deploying itself. An adversary can build up trust for years in some cases in order to catch a big fish.
Considering that browsers are effectively executing arbitrary code on every website you visit, there has to be some trust boundaries established. Ladybird has not been widely tested yet and there is potential to have some very serious bugs. Until it has more testing it makes sense to be cautious, as there are exploit kits that actively exploit every new CVE.
There's millions with advanced computer science degrees just sitting on their bum all day because despite having perfect resumes they get no responses from thousands of applications. I hope AI addicted companies learn their lesson.
With the proliferation of illegal proxies, vpns and scrapers you can't trust the authenticity of traffic anymor. It also means that the internet is getting "ossified" as only a small amount of trusted protocols and clients are allowed now. With malware finding even more back doors the internet basically is an untrustable medium now. Cybersecurity has become pointless because the maniac is in the mailbox.
Now all these obsolete devices have to be landfilled instead of being used in retro computing environments. Everything is being trashed due to AI. I've also heard of many indie websites shutting down due to only getting views from scrapers.