What can be the consequence of not having entry/exit stamps in passport?

Basically, many countries are not engraved on passport now. All immigration points have smart doors you can stamp through these doors

There is no general problem even if there is no stamp, but as you can see, there is no physical evidence that you traveled to another country on a particular day. Even if you swipe the smart door, you can not get travel data from your passport. Since you have to file a lawsuit and have to ask the external department to check the details of the country you used to travel with the smart door, you need to prove that you are not present at the time of crime in that country I assume there is.

When you travel abroad, your passport may be engraved on each country's entry and departure. Most countries want to set at least one blank page for these stamps. For example, in South Africa you need to put two blank pages side-by-side, but if you enter South Africa more than once on a trip, you need two blank pages for each entry. If you are going to a country where you need a visa, it is even more important to have a blank passport page. In most countries that require a visa, you need to display two blank passport pages side-by-side, one for visas and one for immigration stamps. Under international law, it is prohibited for the consular office to stick a visa sticker on the immigration stamp or on the change page, so at least a completely blank page is required as a visa label.

Page 8 - 24 is a visa page. When talking about "blank passport page", we are talking about these pages. The word "Visa" is displayed at the top of the page. These pages apply to all inbound and outbound stamps collected during the trip. If you need to get a visa for your trip, they will be posted on these pages. Pages 25 to 28 are approval pages. These pages are labeled "Recommendation / Reference details / Annotation". Certification pages are used only by the US Department of State. If there are special conditions or passport changes on your passport, the Department of State will print it. For example, if you acquire a new passport after losing your passport, you may see one of the recommended pages saying "This passport will replace your lost or stolen passport."

Using an electronic passport, rarely have an actual visa or immigration stamp. These more stamps are still getting less and less as more and more countries allow travel without visas. The irony of a "strong" passport is even more obvious. Recent rankings indicate that a New Zealand passport allows visas free travel to 171 countries. A country without a visa generally does not stamp. However, since there are only over 200 countries in the world, we can travel a bit, but there is no corresponding indication on the passport. Most of the beautifully designed passport pages are almost empty. We can marvel at a beautiful design, but there is no page on the passport. By using an electronic passport as a mask, the social needs centering on storytelling and boasting will be ambiguous. Well, we may now have an app that allows us to build a story about traveling. However, traditional passports meet these requirements in more styles, authenticity, and on-site.