Why does it take so long to get stuff?

So I ordered some speakers from my hifi dealer - $4500 ProAC’s. I was told they would be 3-5 weeks for delivery. Now I love the audio store and value the dealer network but in this day and age why does anything take 5 weeks. I went with the ProAc due to the dealer support etc but an alternative was a Buchardt speaker. 

Buchardt was $2500, gets great reviews, and arrives in 1-4 days anywhere in the world. 
 

In the UK the ProAC speakers are, in todays Exchange rates, roughly $3300. Now I don’t mind the mark up (but it’s a lot). Now assuming the dealer has them in stock why can’t they direct ship to me, or the store in 48 hours. I think it’s time the traditional manufacturers started adopting this style of approach - everyone in the chain can still get their mark up - but customers who be able to get what they want quicker. 

This delay is just making me question my purchase — I guess I’m too impatient but it’s the reality of commerce these days.