Why avoid ETF?

Why should investors avoid ETFs? Aren't they supposed to offer diversified exposure to the market with relatively low costs? Could you please elaborate on the potential risks associated with investing in ETFs? I've heard about tracking errors and liquidity issues. Are these significant concerns? Could you also discuss any other reasons why investors might want to steer clear of ETFs? I'm trying to make an informed decision about my investment portfolio, and your insights would be invaluable. Thank you for your time and expertise.