Once calling land the best investment, it is not true to say that it is illiquid, your statement seems contradictory. The so-called best investment is a safe investment, the value is always increasing and has quick liquidity. I have never seen anyone have trouble liquidating land unless you sell it for too high of a real value. Land is certainly the best investment, but we shouldn't invest it all, diversity is always needed in the investment arena because the future is unpredictable.
Diversity is important for accumulating investment value and can also reduce risk if investing in other safe haven investments, some people prioritize adding gold investment because investment has the potential to maintain stability and low risk from the impact of inflation. The average person has both of the above investments for long-term investments because they quickly liquidate for any time if we need emergency needs.
We have to be wise in managing our finances because we don't place just one investment for land property but must combine other investments to achieve higher profits in the future.