Asking questions is the best way to learn!! It's important, especially when making an expensive and important purchase such as a computer. I first started thinking about the 2018 MBP back in July when they were first released, but kept reading and waiting, reading and waiting, asking questions on MacRumors, reading and waiting....and then just as I was about to make the leap, Apple went and added two new graphics options, so then I found myself waiting some more, reading and waiting.....Professional and user reviews and comments are indeed most helpful. This past Tuesday the waiting came to an end as I went to my local Apple store and at last bought the computer.
I don't use an app to import image files into either my MacBook or my MacBook Pro..... I plug in the card reader and then in Finder create a folder on the desktop for the images, and then after that I can take them into whatever app I want for culling, reviewing or actual editing of the images. I've been using Luminar a lot, as I never could quite get the hang of Capture One Pro 11, and now the latter has a new version out but I'm not going to upgrade to it, at least right now; I will try and spend more time with the version I have on the older machine so that I can decide if I want to keep pursuing it as an editing tool. I am looking forward to seeing what Skylum has to bring us with their new version of Luminar 3, which will for the first time include a DAM, later this month.
My new 2018 MBP is a real speed demon! She is 15", Space Grey, with i9 processor, I TB SSD storage, 32 GB RAM, and the new Vega 20 graphics. I will be using her as my primary machine from now on. Have not yet decided on whether or not I will also get an external monitor to use with her, which would be useful with extensive image processing. I've only just recently gotten back into doing much shooting at all and am still experimenting with the direction I want to go now. Back in 2015 when I bought the then-current 15" MBP I wasn't doing a lot with photography and somehow never felt the need to add an external monitor. It's a little different now and things are changing.....
The older 2015 15" MBP has a configuration of i7/512 GB SSD storage/16 GB RAM, so in her day she was no slouch, either, and at age three still can pretty well hold her own. The 2017 12" MacBook, the one which is my traveling companion, is maxed out, too, with i7/512 GB SSD storage/16 GB RAM. That lone port on the MacBook can be a pain but most of the time I'm not doing a lot of photography when traveling so the MacBook does well enough when I do need to import images into the machine for reviewing and as a temporary backup. If I traveled extensively and took a lot of photos on all my travels I would purchase a 2018 13" MacBook Pro, as it is both relatively lightweight (although not as light as either the MacBook or the MacBook Air) and powerful, plus I believe can be maxed out to a greater extent than the 2018 MacBook Air if one wants to do that.
Hope this clarifies a few things for you...... As anyone who has been around here a long time can tell you, I'm a dyed-in-the-wool Apple Fan Girl, no question about that!