I'm not too concerned about hydraulic brakes as I don't use the brakes much for my use. I'm riding down rural roads a lot and know well in advance when I'm going to stop slowing up to minimize brake usage. My 13 year old Trek standard bike has caliper rim brakes, and they do the job fine for me. I came home in a downpour once, and they still did the job, didn't even think about it. On these hot days (heat index was 100+ here yesterday), I hold off until evening to start riding, especially longer rides. I rode 57 miles a couple days ago on my standard bike, and I didn't get home until 12:45 AM. But June through August are my biggest months for riding.
I'm actually now considering ordering the new Espin Nero for early bird $999 pricing, so that I would start with one fat tire bike and then order the Ride1UP 500 in time for next spring, so I would have two bikes for about $2200 total. I like the idea of two different styles of e-bikes, plus it gives me a backup if one is out of service temporarily. I would skip the racks because I don't use them much and already have one light-weight rack I can use, currently on my standard bike.