As I said in another post I suspect that the way 'N3' is being used is a bit sloppy and not being used consistently across all of these stories. Some folks want to cast N3 as only being N3E . I don't think TSMC uses it that way. I also don't think TSMC completely forks N3E completely out of the "N3 family" either.
My suspicions. #1 is partially related to ....
"Rialto Bridge cancelled ..."
https://www.servethehome.com/intel-announces-it-is-ending-traditional-hpc-platforms/
I don't think this was a huge amount relative to N3 being fully scaled up. But could have been a substantive amount in the first 1-2 quarters of the N3B production ramp. There were other reports about Intel buying up all the very early N3 production. Well, the very early N3 production is going to be smaller. So it is easier for a smaller buy to cover the a larger fraction early on.
Riato Bridge was mainly going to crank up the core counts and pull back on some of the excessive disaggregation of Ponte Vecchio. N3B isn't easy to work with
and they are having trouble getting Ponte Vecchio out the door in numbers (in part due to the high complexity).
In short, that was only "oversubscription" in the first quarter ( maybe part of the second quarter) of HVM.
All compounded by Intel discrete GPU business scale out being a hot mess.
#2 is likely also talking about different quarters at a different stage of roll out process. Too many folks are skipping N3B and so there is giant log jam building for N3E which will only happen in the second half of the year. Q2 will likely all be under capacity and then in June-July it all breaks buck-wild. The slow baking N3B stuff will soak up a disproportionate EUV machines and and everyone who wanted to jump over N3B will soak up any slack.
Here TSMC is talking about the combo of N3B and N3E as 'N3'. If the A17 is on N3B then the iPhone demand bubble is going to overlap some with launch of N3E.
"we expected N3 to be fully utilized in 2023"
Doesn't necessarily mean the whole year. Just a substantive part of the year. Before N3E gets started (which has most of the tape outs ) there isn't going to be a way to saturate it.
#3 again , talking about Q1 '23 and parts of Q2 '23 isn't the same thing as talking about the whole year.
There is a bit of games played here also. When TSMC plays the "scarce wafers better get your reservations in" some folks block out capacity they may not use "just in case". That was chronic during peak of pandemic driven shortage.
A bit of the oversubscription is likely going on here at the end of 2023. If economy slows down in Q3 some of that will disappear.
Throughout much of 2022 there was lots of talk by some about how horrible N3 was and that everyone should skip until TSMC came up with something better ( i.e., N3E cheaper and shorter bake times). N3B didn't start to many peoples expectations. TSMC said 2H '22 and many took that to be likely July-September. It was closer to November-December (technically still in 2H '22 , but with longer bake times ... really won't deliver heavy volume until 2023. )
Have to locate which part of the ramp folks are talking about. Some folks think the HVM (high volume manufacturing) mark is 'late stage' rollout milestone as opposed to 'pre mid-life' . There is still capacity ramp after HVM.