I hear this all the time but I will never criticise anyone for misunderstanding the project being for capacity rather than journey times. The project is called High Speed 2.
If the perception wanted was that it wasn’t mainly for faster journey times it should have been called something else. In fact given politically unpopular nature of HS2 and its much reduced scope it might be a good idea to change the name to better reflect its purpose.
Those opposed to HS2 (at least those at the top) actually know it's been about capacity from the beginning, if they don't they clearly haven't reviewed all the information held on the StopHS2 website.
From another thread:
Just one small point, HS2 had always been about capacity, if you don't believe me StopHS2 have a letter on their website from February 2009:
http://stophs2.org/wp-content/uploads/2011/09/20090213_letter_to_lord_adonis_re_objectives_for_hs2.pdf
Capacity is mentioned as the driving consideration and even under speed it takes about "achievement of maximum capacity".
Early on the debate was often framed as "HS1 have met it's growth targets".
Unfortunately HS2 wasn't overly optimistic about passenger growth numbers, by assuming 2.5% growth each year, and when that was exceeded (by quite a margin) they then adjusted growth rates to (IIRC) 1.7% so the usage at opening wasn't higher than before.
In 2026 the model assumed something like 152 passengers for every 100 passengers in 2009. By 2019 London/North West and London/Scotland were both at about 170 passengers.
Now in 2021 that fell to 110 passengers (London /Northwest) which is very short of the 152 predicted - however rail use was still very much suppressed for much of that year.
Over the 5 years from 2021 to 2026 we'd only need to average 6.8% growth each year to be back on track. However in the year since March 2022 (the end of the 2021 data) to March 2023 there's been 11.47% growth at Avanti, meaning that the next time the regional data is released there's a good chance that there'll be about 125 passengers for every 100 in 2009.
That would mean growth rates of 5.8% each year to be on track to get to 152 in 2026, a figure which isn't so wildly out there that it could be discounted out of hand for being totally unachievable.
Even if in 2026 it's 149 passengers, that's not so far behind (-2%, or less than 1 year of the original growth predictions) to make it crazy to have built HS2. Reaching 149 would still be -12.5% on the pre pandemic values (expect a lot to be made of that fact if we get to that point, as it'll look good for them, even though the HS2 predictions were almost spot on - as few will know enough to understand that, even though some opposed to HS2 do understand this and will use any argument that they can to put the project down).
It's like when in 2019 rail growth rose by less than it had in the early part of that decade, much was made of that - even though the actual increase in the number of extra people was still broadly as the predictions had expected as the numbers were so far ahead. As 1.9% of 170 is more than 2.5% of 128.
Some of the regions set to benefit from HS2 even saw 0% growth in 2019, however that could have stayed like that until 2031 and it would have still been not behind the HS2 predictions.