Dude, this ETA and visitor rules thing is a bit of a head-scratcher. So, the Electronic Travel Authorisation (ETA) system is meant for people who don't need a visa to visit the UK, right? Like, it's supposed to make travel smoother and all. But here's the kicker: there are some mismatches between the new ETA rules and the older visitor regulations.

In my opinion, these differences could cause a major oof moment for travelers. Imagine this: someone applies under ETA 'cause they're told they don't need a visa. They get to the UK, and suddenly, bam! They realize the visitor rules say something else. It's almost like having two different roadmaps but still trying to reach the same destination.

People are worried 'cause this mismatch might lead to inconsistency in how cases are handled. It's kinda like playing a game with two sets of rules, which we all know spells chaos. It might take a bit for the government to iron out these kinks, but until then, travelers should play it safe and double-check which set of rules applies to them.