It's pretty fun tech, you should do it
It's a good question on the small laptop or ipad. For my usage scenarios, it just became extra unnecessary weight and stuff to have to bring. I look at it this way, I'm going to be bringing my phone no matter what, so I might as well make it my main computing device.
I used to travel with a 8" windows tablet PC. It works well, but I just felt dragged down having it on me all the time. When I have to wear a suit, there's no place to pocket it, so I have to bring a small satchel-like man-bag when I go to conferences or meetings. And you will always be conscious of it. A phone or projector can go in any pocket and you won't notice it. The tablet is also only Atom powered, so not a lot of horsepower. I've found that it was better to use RDP to do any sort of serious number crunching. Dragging a laptop around is a non-starter for me when it comes to lightweight travel.
The other issue I had was security. Depending on some international hotels, sometimes there is no safe in the room or you'd have to rely on some front desk lockbox. So I just felt it was much safer to bring a phone with me than it was to leave a tablet at the hotel. And, at least in Europe or Asia, I feel like I can always get another replacement phone from a telco shop, whereas I think a laptop/tablet would be tougher to shop for and re-set up.
The projector is about the same footprint as my Note 4, maybe about 30% thicker and about the same weight. Plus, this can replace an external battery charger, which I used to bring anyway. The projector isn't perfect by any means. Small fonts aren't clear like you see on laptop monitors, I think anything below 12 pt is hard to read. And if you don't have a nice wall handy at the moment of need, you're kinda SOL.
Anyway, don't resist! I work for a forward thinking company, so having tech like this matches our MO when I do presentations. Pairing all this stuff with a TextBlade is going to be an interesting day.