People have been wrenching without the coolant vacuum filler tool for a long time. I'm sure it's great but not on the high priority list.
I agree; I have been "in it" for 25+ years and STILL have to buy tools/equip regularly to keep up.
I took a few years off looking for "something greener" and wound up in places I never before previously dreamed of including working for min wage again in my 40's and a stint on SS Disability after a "Home improvement" accident right in my very own front yard and a trip back to Community college for an Associate's degree in another field, that did me no good to this point, BTW) and I wound up going back to what I know, which is wrenching!
I am 10 years older and have 5 years more "hands on" experience at being a pro mechanic than my 2 co workers do, but I seem to have to "borrow" stuff from the younger guys more than the other way around.
Part of that is that auto repair is becoming way more specialized these days much like you wouldnt have a brain surgeon set a broken ankle, I was an alignment, brake and under car specialist and now working in the fleet garage I do "everything"
Like no shop I previously ever worked at did any AC work; now it makes up a huge portion of the work orders;
It depends on the type of shop you get into as to what you need; if you get into say a Chevy dealer you most likely don't need many "special" tools geard towards Ford. and the Chevy dealer should have most of the "specialty" stuff that pertains to them.
If you get into a ****** shop, you wont need cam bearing tools, piston ring compressors or valve tools... so figure out where you wanna go and alot of "what you need" will be determined by that.
I too have my own scanner. The current shop I have has a "shop" one, so my personal one stays home. No other shop that I have been at did I EVER need a scanner-- and when we did, we'd "borrow" one for "just that ONE job" or farm the car out... again dictated by the type of automotive work we did.
I primarily have my own scanner so I can do my own cars here at home... on my own stuff (only) yes I do everything it may need except for things like alignments since it dont pay to spend thousands nor do I have the space for something I'd really use maybe twice a year. (besides, I do have "buddies" that "help me out" whenever I do need an alignment or tires mounted/balanced etc on my own personal vehicles)
these days there are not anywhere near as many "we fix everything" types of places like the Old days.