In light of the new affordable Mac Mini 2018's, and the extra bonus of it being user-upgradable in terms of RAM, I've already got a NAS with tons of storage available so 128G SSD is effectively a boot drive.
It's affordable for a base model with 16G RAM, throw in some SO-DIMMs to make it 32G, it's now a small tank. I currently run a MBP 2015 13inch - it's nice, but the ports broke and a logicboard replacement is $800 - just shy of the price of a new Mini.
- Ditch the MBP 2015 13' in favour of Mac Mini 2018 with 16G/128G
- When I'm "on the go" and want to sit at my relaxing lazyboy chair, have a bluetooth external monitor, with a bluetooth keyboard/mouse - take a tiny hit in terms of latency (not major due to distance), but get the portability I desire - I work exclusively in my office at my desk even with a MBP, and never tend to take it anywhere far, so I'm not taking a big hit using a Mini - it fits my lifestyle accurately
- Use the thunderbolt 3 ports to connect two more monitors (2x4K) on top of my existing 4K monitor, to make 3 4K monitors
What's your gameplan if you were to make the switch?