Mophie Launches New Powerstation USB-C 3XL for Charging Apple's MacBooks

Hmm, am I even able to fly with these high capacity power banks? I thought max capacity is 10,000mAh?

As a Frequent Flyer with over 4M miles on AA (which includes a lot of miles on British Airways, that has zero power ports in economy) I've used various AC or DC power sources a lot over the past 10+ years. Here's what I've found:
1. the 26,000mAh capacity translates to just under the max 100W that the FAA and EU allow on planes.
2. I've found that the 87W power brick for 15" MBPs is a bit over the rating of my aircraft AC power outlets. It will work maybe 40% of the time, mainly if it's plugged in/out/ion over and over.
3. So, I am switching to the 61W AC brick that's now used for the 13" MBPs, as I almost never need to full charging capacity of the 87W brick.

The RavPower units has been very handy on many flights, train trips and bus rides where no power outlets were present, and they are great in an emergency power outage situation to keep my phone charged.

BTW - there's another EXTREMELY VALUABLE accessory to have with the USB-C powered MBs & MBPs (in particular for those who miss the fall protection that Magsafe used to give): i.e. the Griffin magnetic USB-C cable. See this:
https://griffintechnology.com/products/power/charging-cables/breaksafe-magnetic-usb-c-power-cable

Adobe photoshop and Lightroom are power hungry applications. What are your recommendations to optimize batery life

They're power hungry because Adobe hasn't ever bothered to build them properly for the Mac. Because of that, they consume WAY more power than they should. If Adobe would ever bother to write them properly for the platform, not only would they consume far less power, they'd also run far faster.

Not much you can do about those two piles of crap (I use them frequently too). Stuff like setting brightness down, limiting background apps, etc can all help add to battery life. Disable any unneeded options, animations, etc.

Bring along the power brick?

Do you mean he should use his stock Apple charger? If so this makes zero sense. The whole point is to be mobile which also means ideally no wall worts. Why bother making USB-C MBP with a USB-C power if we cannot extend laptop usage without relying on wall worts? This is actually the only reason why I’m upgrading my 2015 to 2019 MBP. So I can easily charge it using a 3rd party USB-C power brick and not need an airport/cafe wall wort. When I travel many smaller cafes lack power or other people are using all the wall worts.

Any suggestions for one that’s actually great for a beefed-up MacBook Pro?

Bring along the power brick? At $200 and with added weight it seems to me that you'd be better served topping off with your power brick if needed.

If you're running your MBP at full throttle while unplugged then I'd optimize your workflow as OldSchoolMacGuy suggested.

Any suggestions for one that’s actually great for a beefed-up MacBook Pro?

You should look at the Ravpower RP-PB058-2 for $79.99 on Amazon. My org has used 3 of these with 2016 & 2018 MBP 15" as well as MBair 2017. It works well with these, plus iPhones or Android phones. It can be Quickcharged also. The Ravpower has more ports than the Morphie.

Any suggestions for one that’s actually great for a beefed-up MacBook Pro?

This is about as large as you're going to find right now. Honestly, if you need that much additional use time, I'd just grab a MacBook Air in addition to your Pro. Most of the work the vast majority do on the road doesn't take the processing power of a Pro. If you really need it, I'd think about optimizing your workflow and settings within the machine itself.