Why do people suggest buy and hold large index funds?
Even if someone wants to passively invest, buying and holding the same thing forever doesn't seem optimal. You would likely have more success by investing more targeted funds that are focused on tech stocks, like QQQ, SMH, SKYY, that are trending up against the market over the last several years at least. Sure, the market could change eventually, but so too can you change your investments. What you gain against the market in the interim will more than make up for whatever you might lose if one day tech starts to underperform, before you have the chance to rebalance. Fundamental changes in the market don't happen overnight and without warning, so it is much more plausible to time the market on an annual basis than it is on a daily or monthly basis like shorter-term traders do.
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If you're bringing up these points you're beyond that advice. It is meant for the average Joe that would know no better than to blow his money on whatever hype is going on.
Now go back 70 years to 1951 and simulate your strategy of buying the highest growth stocks/index funds for the year at the end of each year vs a portfolio holding VTI.
The portfolio using the strategy would be completely broke long before the end of the 70 years but the portfolio holding VTI would hold massive wealth.
Or don’t backtest and just do it and learn the hard way by forward testing it.
Just contributing more to that funds as your income grows also grows your investment good enough when you retire
If you’re so certain of your approach then do it. Good luck recovering from 50%+ portfolio drawdowns 3-6 times over in your life then magically making it back with your superior multiple times beating portfolio selection.