Despite home biasness and possibly missed opportunities by only investing in SGX stocks, the big deterrent for me to dabble in overseas stock markets are the additional costs of trading and holding the foreign exchange's stocks. See https://the-international-investor.com/international-stockbroker-list/singapore-stock-broker-list
Trading commission + nominee service fees (custody fee, admin charge etc) + FX fee + withholding tax on dividends
And of course... I am just too lazy to monitor other markets. If I want foreign market exposure, buy shares of companies with stakes overseas lo......