The problem is a lot of people think that because Intel 10nm was a big fat failure that it is a road block to 7nm - but Intel's 7nm is not a refinement or evolution of their 10nm - it started life separately to 10nm with understanding that many of the technical aspects that have stumbled the 10nm development would be issues while they thought they'd get away with it a 10nm. Obviously then there is the whole mismanagement side but that is another story.
Yes, that is the exact same story Intel told everyone with 14nm delays in regards to 10nm, the reality is utter utter bull.
7nm is going to use EUV, but as with everyone else, not for every layer, it's slow and ludicrously expensive and simple equipment supply is an issue and they've also only got plans for a single fab for 7nm so far. It's not financially viable to go all EUV which means many if not most layers being done with quad patterning. The problem there is that it's a fundamental part of the 10nm process. What other things are part of 10nm process, yeah, cobalt usage (something people hype up as new but TSMC have been using since 16nm, the only difference is Intel is using more of it and in different places and a different gate design), gate designs, equipment, yields, etc.
The idea that anyone can simply make 7nm completely separately from another node that uses most of the same technologies is simply absurd, completely and utterly absurd. they worked on them concurrently but every single company is working on technologies for the next several nodes. Intel is talking a big game and it's all bull, it's stock market messaging of their issues. Ignore these delays sure they are bad but the next thing is on track. As said the exact same story they gave for 14nm delays and how 10nm would get them back on track... oops.
All that is really happening is while Intel work on a non EUV 10nm process they are also working on EUV and getting it working ready for 7nm and some other improvements. Every other company is doing the same.
More over if 7nm was 'on track' and was limited by EUV and they had a 2 year lead on the rest of the industry, why are Samsung and TSMC going into production with 7nm EUV and TSMC are starting risk production of 5nm EUV (every bit the match for Intel 7nm) next month while Intel has absolutely zero signs of 7nm coming before 2021 at the earliest (and extremely unlikely imo). If 7nm was being made independently and wasn't effected by 10nm issues, 7nm would have already launched, that's how late 10nm is.
7nm will fundamentally rely on everything that isn't currently working on 10nm and anyone who thinks otherwise is crazy or buying Intel's excuses.
Also as Anandtech's latest article on Intel's claims about 7nm being on track say, well those quote sums it up..
That said, Intel is clearly not skipping any of its already announced 10 nm products, but implies that its 7 nm products may hit the market earlier than we might expect today (i.e., four years after the 10 nm).
Right now Intel has taken so long to go from 14nm to 10nm that their entire process lead has literally disappeared and now gone the other way. Intel 7nm isn't likely to be any better than TSMC 5nm which could have some low volume products out by the end of the year. If the market things 7nm will be the same gap as 10nm took, Intel's stock will crash. Intel is basically lying about the process being made separately because they need the market to believe 7nm isn't 4 years away.
The 7nm team likely is working on mostly different things because ultimately their base assumption is 10nm works and that all their SAQP layers will just work because the process has been out in volume for a while, their only real focus is making EUV work on smaller features for the critical layers done with it.
The reality is it's much worse than the 14nm to 10nm jump, because while they lied about how 14nm delays won't impact 10nm and it's on target (lol), the fact is 10nm uses quad patterning and cobalt while 14nm used double patterning. IE 10nm was a completely different tech, though in reality if you can't make dual patterning work good luck making quad patterning work. However the reality here is that 7nm will use quad patterning DUVL layers, exactly what 10nm uses, 7nm relies on the equipment and 10nm node much more than 10nm relied on 14nm.