Seagate's quality had decreased these days. I primarily used it only if I want to access some files quickly. Keep in mind that like all things, HDDs decay faster the more it saw action. Deleting files in it, copy / pasting files, executing a program in it, etc. will decrease its overall life expectancy.
Though what killed it the most is constantly plugging / unplugging your HDD from your PC. I highly recommend that you use a USB hub multiport distributor, to minimize the damage done to your HDD. That way you can just replace the port distributor, instead of letting the plug/unplugging action damage your HDD. Just the ones with 2 or three ports is fine. Your average laptop wouldn't be able to handle the simultaneous workload anyway (unless you're on a beefy gaming PC).
I've heard that some people said that "simple wear and tear" wouldn't damage your HDD, but I call BS on that. Those words usually came from the educated developers who knows how to care for their computers, and not your average civilian users who plug and unplug their HDDs, more than horny rats on breeding session.
Like all products, HDD is a lottery. Once in a blue moon, you'll get a defective product that somehow passed their quality control. They might reimburse you for a new HDD, but who's gonna reimburse all your data? Certainly not them. In the past (when I still didn't know better), I've damaged plenty of my HDDs and suffer devastating loss of datas. Even after I eject them, unplug them carefully, and handled them like a literal baby. I would not risk another data loss again. If you want to experience it too, then be my guest.
For long-term storage that saw minimal action, I recommend a few WD externals. Go make multiple backups over several external HDDs and you're good to go. Just buy several 1TB ones or a couple of 3TB tops. I don't recommend anything more than 3TB for financial reasons. Rotate between them every few years, if you're that paranoid.
Can't confirm whether planned obsolescence in HDDs is a thing or not, but it wouldn't surprise me. The HDD market is practically a giant monopoly by now, and they monopolizes the professional data retrieval market and its retrieval technology. If you don't want your data be "taken hostage" for exorbitant amount of price, you might want to have a backup or two.
This information is true as of today. Alas, I dunno how it will all change in the future. Some even say that external HDDs will become obsolete in near future.