So yes. It is political and whenever someone tries to make Brexit out to be bigger than it is... it's usually because of their own political bias's rather than the cold hard facts. Even more 'annoying' when they say 'not to be political'. It's like saying 'Don't mean to be rude, but.... *followed by rude af statement*'
I don't really care about Brexit, I live in Scotland and soon enough we'll make our own decisions - again, not political just stating facts. As for Brexit - it was never about facts, it was about taking back control... something I fully agree with and hope to apply to my own country soon enough.
The problem with trade, is that agreements take a long time. We can have an agreement with Taiwan as the UK, but they haven't started yet. You mentioned talking about facts, Iceland - per your example - are part of EFTA, European Free Trade Association, a grouping of four non-EU European countries, and is also part of the European Economic Area (EEA). They'll have no friction importing AMD CPUs from a core distributor - as I doubt there are many flights from Taiwan laden with AMD CPUs for Keflavik - but they'll go to a core hub, then distribute from there to UK Distributors probably... but from Schipol or Frankfurt to Iceland has no friction... to the UK it'll have tariffs and admin - as it stands today. Anyone who used Heathrow as a hub, now will be considering not using Heathrow post-Jan because of said friction. Its likely that only good destined for the UK will arrive in the UK, and we'll have no distribution hubs for air freight... I'm not stating this due to political bias, its just a fact. The trade agreement with the EU if negotiated negates all these issues... if they don't negotiate, or add some tariff/admin, it'll have some impact. January won't be a great time to be trying to expediate anything into the UK isn't bias, its just a fact for anyone planning imports... March might be fine though.
Sorry if I pricked your bias on Brexit not being a "big thing...".