In my assessment, for my usage, 8 GB is adequate for most of my laptop usage. However, the key words here are "adequate" and "most". In some situations, when I am heavily multi-tasking, even on my 12" MacBook, 8 GB can be limiting. And even when I'm not heavily multitasking, 16 GB can be beneficial in some regards.
Some of those saying we don't need 16 GB are looking at it the wrong way. Sure, 16 GB is a lot. However, 8 GB can be limiting. What we should be asking is not if we need 16 GB, but if we want more than 8 GB. Personally, I think the sweet spot for me for the next few years would be 12 GB on my MacBook, but that option doesn't exist and the only upgrade option is 16 GB, so I got 16.
Here are some scenarios where/why I think 16 GB can help:
1) Heavy multitasking of course. If you're running lots of apps. This is especially true if you use an external screen, since in my experience, it's a lot easier to multitask if you have an external screen.
2) Multiple users. In my experience each extra user that doesn't log out eats up another 2 GB or so. My wife is notorious for this, although it's more a problem on my iMac than my Mac laptops.
3) VMs. With 8 GB, even just having a 2 GB VM will limit you to just 6 GB for the primary OS. With 16 GB, you can have two 2 GB VMs and still have 12 GB left over. Or you can splurge on your VMs and have 3 GB each even with 2 VMs and still have 10 GB left over for macOS.
4) If you keep your laptops a long time. It seems that overall memory usage often goes up around 50% every 4-5 years or so. So, if 8 GB is good for you now, you might want 12 GB after a few years even if you don't heavily multitask. And even if you don't need 12, you might need 10, which is more than 8.
5) macOS loves to eat memory even when it doesn't "need" to. It keeps apps in memory even after you quit them and are not using them. Is this a waste of memory? IMO no, because when you come back to relaunch the app, the access is much faster if it's already in memory. This is particularly helpful for some bloated and slow loading apps like MS Office. For some reason, after a reboot, the initial launches of MS Office 2016 applications even on 2017 Core i5 iMacs is really slow, and of course on my 2017 Core m3 MacBook it is also really slow. (Office 2011 actually launches faster on my decade old Core 2 Duo Macs than Office 2016 on my 2017 Macs.) However, even if I exit the MS Office apps, when I relaunch them later, the relaunch speed will be fast if cached in memory. Yes, you can blame Microsoft for how they've built these apps, but that doesn't solve anything. The bottom line is that having more memory helps with bloated apps. The programmers don't seem to care that much in this regard. If their apps use a lot of memory, then they just expect their customers to buy more RAM to compensate, because they can.
BTW, I was almost tempted to remove Office 2016 and reinstall Office 2011, but 2011 is no longer supported, and 2016 does have some extra features like integrated OneDrive support.