For better and worse this site is a mix of pros and amateurs. The upside is lots of great knowledge to draw from. The downside is sometimes the correct answer differs depending on who is asking. The right answer for a pro may not be correct for an amateur. I grew up using my dad's tools in his shop. His shop wasn't a hobby and the tools often reflected that. My garage is a hobby and that means I typically care a lot more about low cost as I won't use the tools day in and day out. Like the OP I've done a lot of car repairs with limited tools because I can't justify a lift etc. If I think hard about it few times would I say I
needed even the compressor I have to finish a job. But often it makes the job much easier. Like many shade tree mechanics, time isn't exactly money to me so sometimes it's ok if it takes longer with a lesser tool.
That said, having grown up using good tools I love it when I can "justify"or luck into a good tool of my own. I'm sad that when I lucked into three 80 gallon compressors (one needed a new pump) I had no garage to realistically put them in. My father and two sibs were the benefactors of my good fortune... I'm still living in 120 V land
Thats the ups and downs of me asking, I was kind of hoping someone would point out a limitation I mightve missed with my specific needs but so far it just seems like people recommend larger for expandability (which I get to a point) but Im kind of at a point where I've gone overkill sometimes and regretted it.
I dont do automotive for a living or even as side work, I work on a few of my project cars from time to time. The only reason I need air is for when air is a necessity like filling a tire lets say specifically.
I actually just purchased a lift because the lift is something Im willing to deal with given price, space, electrical needs, etc because I spend most of my time lifting my vehicles up and down for suspension installs/changes, brakes, tire rotations, oil changes.
Im the same with way certain tools, Id rather do something slower and avoid getting certain tools that I would only use once in a blue moon. When it comes to a compressor, Ive never had one and did plenty. My main concern isnt even price, its more about it taking space, noise and maintenance.
If Im going to use air so sporadically I dont want to give up a lot of space in my garage, nor do I want something loud because I usually work on my cars in the evening and my garage is a vinyl one so noise is a big concern.