So, the m5 with 48gb of ram will be amazing.
I have a 2010 MacBook Air that I still use when traveling.
The battery is completely shot, but it works fine when plugged in. And if I'm on the road, I don't use my computer until I get to the hotel anyway. And even then, it's just fine for e-mail, browsing, and even Photoshop.
Am probably giving newish iPad and magnetic keyboard a spin on my next trip mostly to see how it goes.
Obviously the LLM inference is super heavy, but the actual work / task at hand is being executed on the device.
Is still handling the load well, though at times, fans get quite loud, especially with all the background processes and VM setups.
Hope to get a new MBP this year, as being on Intel means lots of software that won't run on it (ie, Codex app for example, won't run on Intel Macs)
(Maybe the fans sometimes sound like they're a jet engine taking off…)
Finally just put an order in for a new 16" MBP M5 Max with 48GB memory only because it looks like they're going to stop supporting the Intel stuff this year and no more software updates. It'll probably be obsolete in six months with the rate things are going, but I've been averaging seven years between upgrades so it should be good!