I work professionally in plant maintenance, so I cant speak totally on behalf of Automotive. I have worked on plenty of forklifts, sweepers, loaders, things with engines but that doesnt totally count, I still count those as "machines", although mobile. I could possibly see the need for special sockets and thin wrenches on todays cars. I simply do not need such items, I can make alot of different tools work. I have almost every brand under the sun, with Craftsman taking up the most space in my box and have likes and dislikes from every brand. I used to buy off the Snap On truck when I worked at my last shop, it was convenient to a point, but also not so much If I had to order something or wait awhile, it had its ups and downs, cost for sure being the biggest down. I am now to the point where I dont really need any more hand tools at work, or at home for that matter. I love tools but why tie up tons of money if half of them wont get used, so I learn to make the most of what I have and do pretty well at it without tearing up fasteners and parts, I try to work lean and smart.
That said I cant fault any professional for buying a specific brand of tool, if it fits your budget and you aren't going to miss your house payment because of it, fits your hand, style, whatever, and works for you, then by all means! Warranty is almost a moot point with alot of tools, some others its more important. If I just spent $20 on a Snap On screwdriver, yup, its going to have a lifetime warranty. $3 on a MIT Impact socket that I will probably never break anyway, I wouldnt think twice warranty or not. Enjoy your tools whatever brand you choose, and use em' the way they were meant to be used!