Over time their timings would drift and you could never get the entire screen completely sharp.
That thing was a tank! I bought it at a CG house bankruptcy sale in the 90s for $2k, which was less than half the going price at the time.
But you're right, it weighed a ton. It did need periodic degaussing. And when a communication company half a mile away put in some satellite uplinks, I could see when there was heavy communication traffic by a slight color shift on one side.
In the mid-2000s, I worked at a place where we had several "decommissioned" Indys living a second life as Apache servers for some of our hosting clients - not uncommon in those days. We had one of the big 19" 4:3 CRTs on a KVM, too, and its weight put a noticeable if graceful curve in the MDF desktop on which it stood.
It was a lot of fun.