No, it's not enough. I used to split my laptops into a 128GB boot boot and a ~2TB data drive (like the old C: and D: days) - this was to make clean OS installs much less painful. I went to more and more extremes to move things from the boot drive to the external drive, but finally, just the OS an applications and settings wouldn't fit in 128GB. And then I noticed the severe performance issue - MacOS considers the boot volume swap file to be part of RAM! I started getting all kinds of "out of RAM" errors and programs crashing. Finally, I reformatted all my systems so that the "boot volumes" are all 256GB. Of course, that's JUST the boot volume.
Think of it this way - when were 200 GB 3.5" hard drives all the rage in desktop computers? Around 2002 - almost 20 years ago! And that was when Moore's Law's doubling was serious. 🙂
My apologies - when I wrote this your post hadn't shown up yet saying you'd made your decision, but sounds like it wouldn't have made a difference. It's funny - there's always been endless talk of the user who doesn't need anything on his laptop - basically Microsoft Office, Mail, and Safari and that's it. Not even the Photos app. I always thought that was a myth - that those people don't really exist - that everyone does something serious with their laptop. But recently, I actually met someone who really didn't use anything but Office and Safari! So at least there's proof that such people are real. 🙂 Of course, those people typically don't buy Macbook Pros - they tend to buy Macbooks and Airs and such. The plus side is people like that save a TON of money on laptops and they can move to any OS with ease. Interestingly, I found that the same people also don't have a ton of apps on their phone - more than on their computer, to be sure, but not that many. They basically live a technology free existence. Pure, relaxing Zen. 🙂