bigger issue is probably around the components fitting in to the bloks, with interfaces and unit costs a problem. say a Wifi module, its probably got a dozen or two pin outs to the main CPU, not two or four like the presentation.
Not necessarily true - you can get wifi adapters that attach by USB which only have 4 connectors. Ditto many, many other peripherals. So long as the larger components have enough connectors to the main logic board then I can't see a problem as most will be just fine on 4.
It's TRIGGERS BROOM!
On closer inspection this idea just doesn't hold water.
The idea is years old!
In an ideal world, a top idea. In the world we live in? Unworkable. No phone manafacturer is going to support this. A lifetime of upgrading, buying new blocks, sourcing what you need for the best price? No thanks, I'll stick to the new Iphone I get every 2 years thanks. Plus Youtube has a million tutorials on it to replace parts on normal phones.