There is nothing wrong with using chart analysis to make predictions, but I dont recommend that you buy or sell Ethereum just because of how a chart looked! Just trade safe, crypto is tricky.
Of course, no one says that - urgently buy, this is a systematic matter, all available funds are spent on investment and trade. Talk about what does not matter, what time to buy - if it is an investment, if it is speculation, then yes, analysis is needed
Thats a guide on your investment or trading, so I dont see anything wrong about it. Regardless of time or date, if you see great signals to buy do it because it can happen though the risk is high but at least you make good decisions. ETH pumps high, its not stopping anymore so i see $300 to be hit again.