[flimflamm]

Cost/manufacturing complexity. If you are country struggling to defend your self you don't think problems in 30 years if today problem is does the country exists or not. Might be difficult to put your self to a small defending countries shoes which is absolute running our of resources.

[halapro]

I get it, I don’t think a timer really adds that much cost and complexity. "If he wanted to, he would" scenario.

[jandrewrogers]

The costs of the self-destructs and failsafes exceed the cost of the rest of the landmine. One of the reason mines are used is that they are exceedingly cheap and simple to build at scale. No batteries or electronics. Even a relatively primitive industrial base can produce them.

In practice, only wealthy countries are willing to pay for mines with reliable self-destruct and target discrimination technology.