You'll forgive me if I am suitably impressed by this blogger.The Alexandrian isn't just "some guy". He's an award-winning blogger who's given a lot of thought on how adventures work, what makes them function etc.
He's also published pretty thorough fixes for a number of WotC adventures, and they are pretty good at fixing the structural problems of these scenarios.
for example: Dragon Heist Remix – Part 1: The Villains
edit: So this is why, earlier in this thread, I recommended waiting for his fixes to be published.
Here's the point I was actually trying to make: that you don't like this adventure, or that The Alexandrian doesn't like it, does not make it an objective fact. I think it is the best adventure WotC has produced yet, with an open world section that actually works as such, with plenty of room for DM freedom without also leaving the DM out in the cold (ha!). I think people complaining about encounter difficulty and it not being a perfect introductory module are conflating "good" with their preferences.
Now, that I feel that way doesn't carry any more weight than his or yours, but it doesn't carry any less either.