Wow..... It would be easier to think of non-necessary tools.... well maybe not.
My kid gave me a Bosh bull-dog years ago.... now on my third... use it for anything I gotta whack repeadly.... stucco off walls/concrete chipping/digging/tile removal.... oh yeah drilling in concrete.
Multi-tool.... wish the blades were cheaper.
Ground down florescent handled (so I can find it) 25 cent screwdriver for popping back-stabbed receptical wireing.
I travel to Cali to build for my kids, and even though I take enough tools with me to "work around" most all jobs, I am constantly tearing out my hair when I don't have that tool that would do a job easier/faster that I left at my shop.
Oh yeah, certainly never needed it for 30-40 years, but a customer gave me a stilletto two years ago, and can't explain it, but sure love it... kinda sad though, I think my old eastwing is mad/upset at me.