Reddit mentions of Park Tool AWS-3 3-Way Hex Wrench

They're upselling you, hard. Keep in mind that they make a commission off of sales.

A $400-$800 bike will last you as long as you could possibly want, and if you're a beginner you won't be able to tell the difference between the parts on that and the parts on a $1500 bike. Hell, I spent three summers building bikes in a bike shop, and the only ones that stood out to me as significantly different were the Electras, which were garbage (you're paying for the paint job with those).

The guys at that shop aren't lying to you about the quality of the parts and smoothness, but the function of a $1500 bike will not be twice as good as $750 bike. The difference will be much less pronounced. They are misleading you about the frequency of maintenance, though. That will not be meaningfully different. Getting the brakes and derailleurs back in "whack" is also not terribly difficult, and is something you can do yourself with the help of Youtube.

My advice is to test ride a bunch of bikes under $800 and buy the one that feels best. Use thirty bucks of that savings to buy needle-nose pliers, a three way, and whatever other wrenches fit your bike. Go on Youtube and look up brake adjustments and derailleur adjustments. I just noticed you're looking for hydraulic disk brakes, and the good news is that those are the easiest sorts of brakes to tune - they're pretty much golden out-of-the-box, and there's no cable to stretch over time. If you ever drop the wheels out, make sure to put a shim between the brake pads, as they'll work themselves together over time and that is no fun.

Also, don't forget about the used market. These bikes aren't changing a whole lot from year-to-year, despite what the sales folks may tell you. You can save a lot by getting a bike from someone compulsively upgrading or someone who bought a mountain bike only to discover they actually wanted a hybrid or road bike.

If you want to buy new (and I certainly understand the appeal!), shops will have sales at the end of the summer where they're trying to clear out this year's inventory. They'll also have leftover stock of this year's models when the season starts next year, and they will really want to get rid of those.