>>1897472i've scrapped several allu frames with hairline cracks in the headtube and i've had several steel frames with play in the cups and dented mating surfaces. It's easy to damage that shit and then you're buying stupidly expensive meme tier threadlocker or shimming it with cans or hunting around for bullshit slightly oversized vintage standards.
The hammer is fine it's just a risk. And making a press tool costs like $20 or less, it's just a nice thing to use. Why would you not lol