'Half of all life' including everything is ridiculous. If that includes half of all plant life, guess what happens to the Earth: everyone dies. And of course, even leaving that aside, generation times and reproductive potential varies massively across different types of organisms. Many insect groups reproduce their entire population every year, while long lived trees or whales might take centuries to recover (humans are in the middle, halving the human population only reduces the level to what it was in the mid 1970s). Significantly, saying half of all life vanishes doesn't match what we actually see in the concluding shots of Infinity War: we only see humans turning to ash, not the verdant landscape of Wakanda melting away.

Of course it doesn't matter anyway. The Snap is stupid. It's a stupid idea for Thanos to have, it's a ludicrous thing to implement, and trying to somehow synchronize the 'five years later' reality with everyone destroyed by the Snap was madness from the start. It will never be possible to integrate it forever and it's just going to be an albatross around MCU worldbuilding until the multiverse renders it irrelevant.