See, that's why I'm wondering why so many have made a big deal out of this. I had two slow-starting batches from Notty, but the final beers were just exactly as expected. I don't have a problem with less vigorous activity, so I'm not sure why it's such a huge deal.
Yeast conversion of sugars to alc releases CO2.
There are some posts on this topic about how "my beer went from 1.55 to 1.15 with no airlock activity and all is well."
Hmmm. Where'd the gas go? Is it magic yeast?
Other posters comment on a slow start and fermentation, but conclude that all is well, no big deal.
I'll betcha that if Lallemand came out and said that they had found a new yeast strain that is guaranteed to start within 14 days and may take a month but will get the job done eventually, and they were abandoning their other product lines in favor of this one yeast, and by the way, maybe you'll get some bubbles and maybe you won't, well, they'd be out of business pretty quick.
I mean, let's don't kid ourselves. They have a problem of some kind. Sure, there are some loyal Nott-heads

D) sticking up for them, but how long would that last if Lallemand were to come out with something outrageous like the unlikely scenario above?
This same lot of yeast is either...
- perfect
- slow but okay eventually
- dead and rotten
...depending on who's talking.
That is some really sucky quality control somewhere. Isn't a "lot" supposed to be a description of a batch of product made and packaged during one production run, and expected to exhibit consistent and reliable characteristics and performance? How big is this lot? How long have they been making it?
In my case (a rotten beer), it's a "huge deal" for me.
I'm not retired. I have kids who play sports and I have a job and I fish and hunt and play golf and blah blah blah.
If I put 8 hours into a batch of beer, I want the beer. That 8 hours is not meaningless to me.
YMMV.