Someday, you won't be able to just buy a control arm. Doing so is wasteful, and you are selling yourself short on your abilities while also being delusional in the worth of your time. It's not that I'm crispy, or omniscient. Who in their right mind throws away something that's perfectly good except for a couple small parts that are easily replaceable with a hammer? You don't need a press, you don't even need an air hammer, just a hammer. Not a single person told the guy the actual cause or solution to the problem, you just recommend replacing the whole assembly and assume you need a press because you've never done it before. That's just laziness or ignorance, and doesn't help anyone. Do you really assume he's so lost as to not know you can just buy the assembly? Give him an option other than the one that is so blatantly obvious and more expensive; It should've gone without saying. If you can't afford the time to replace $10 bushings and instead have to opt for buying the $100 control arms whole, what are you even doing working on your own car, let alone trying to give advice to people on how to work on cars? This isn't your forte, and your time and expertise can be much more valued elsewhere.
Discouraging people from buying tools and forfeiting the possibility of them doing the in-depth repair is something that you'd expect to hear from people in other trades who are ragging on mechanics and how expensive repairs are, while being completely naieve to the fact that the tools and knowledge are what could make their cars and motoring hobbies affordable and sustainable.
No one, and I mean no one, goes on here hoping the solution is "replace the entire assembly for $100 more, and save yourself 30 minutes of time". They get that advice from the teenager cashier at advance auto or even a McDonald's, not a repair forum. I hate signatures, but if I had one, those last couple of sentences would be the one thing I'd drill into everyone's head.