Technology

I couldnt possibly deploy with any confidence a large project or honestly a small project I expected someone to rely on without layers of test.

In my world, that depends just about entirely upon how "dynamic" the code base is expected to be after release. We send a lot of things into the field, thousands of copies used for important work, which we pretty much know certain aspects of the system are unlikely to be changed once released. Others are very likely to be changed. "Back in the day" we'd make reasoned judgement calls about which ones would benefit from the effort of unit / integration testing and which ones that effort would be better invested elsewhere. As time marches on, our procedures and cross-departmental "advisors" who aren't so cozy with the code are relentlessly pushing for more and more automated testing. It is safer, no argument, but it also delays launch - sometimes without added value IMO.