It depends on your style. One of my hiking friends set up her hexamid 10 times total, which were all due to weather. I set my lightheart solo up 80% of the time, mostly in bug net mode since I get woken up easily by bugs. It was also great to have for added warmth, privacy, and occasional rain. How quick and easy it is to set up encouraged me to use it more.
To say your shelter is dead weight is a silly argument, much the same as saying a first aid kit or a rain jacket is dead weight. In an ideal world, you can always find great campsites or just keep hiking until you do. In the real world, group pressures, tiredness, getting off schedule, freak storms, and bad luck can lead you to camp in less than ideal places in poor conditions.
Whatever you use, make sure it is practical and you are familiar with how to set it up well before you get out there. Don't be like the guy who couldn't set up his hexamid in a storm and dove into another hikers Contrail, or the guy who sent his shelter forward and spent the night in my tent with me.
You will be happy with the Squall. It is pretty light and would be very comfortable.
A tarp and bivy gives you a modular system that would be great for lots of cowboy camping and could save a few ounces. If you go this route, a full coverage tarp shelter may be a good way to go for privacy, wind, and rain. A gatewood cape, wild oasis, solomid, duomid, ID Silshelter, or hexamid w/ a beak would all be solid bets.