On context they show it, yes. They have mixed bunch of used and new drives on different enviroments and workloads. Drawing any conclusions from that bunch will fail.
No no and no. Amateurs like you only look at results. Professionals like I look how results have been obtained. Remember 2011 when HDD prices tripled? Now, Backblaze is company that needs more HDD's all the time. If prices are ultra high and availability nearly zero, what they do? Grab whatever HDD's they could, no matter what quality. Durability of those drives? Figure it out.
So Backblazes statistics proves nothing about HDD durability getting better.
I don't give much credit for anonymous reviews. Bots can easily make tons of them. Even if those are from real people, quality is often like: Works 10/10, DOA 0/10.
So if say on Backblaze a seagate drive shows that x thousand drives have a failure of 4% and X thousand HGST drives of the same size has .05% .
You would not use that in your buying decision - Yeah Right.
If you have no knowledge how to extract data from Amazon reviews - then that is sad
It's easy to sift most paid or bot reviews .
I also preface if with thousands of reviews .
One of mistakes of Bots/Paid they have a date cluster
3 star and four star reviews often get the most info.
On any review you can check the reviewer to see their other reviews
With hard drive reviews 1 stars often come in batches - so can be discounted if old - as that batch of HDs were defective in manufacture. eg I bought 6 of these bad boys for my NAS and 4 were DOA .
When I look at Anime to watch the scores between IMDB & Anime sites is surprisingly close - if sufficient reviews .
I do find Newegg buyers rate harder than Amazon.
Plus you know that certain drives are huge sellers - so if they were bad - you would get a lot feedback - most happy buyers do not review.
HDs are pretty reliable as they sit in PS3/4 ,Xboxes - media recorders, surveillance etc working away for years - I hear very few people complaining their PS3 hard drive failed
I have a love of science more than tech - humans have an innate ability to see patterns - they will also see patterns in noise , faces in landscapes etc .
Anyway my next assumption is that we will continue to disagree - That I think you can extract info from Amazon reviews and Backblaze and that for you - that you have no ability to do so - as there is no info to be gained