Need Clarification about Vertex Snapping usage

Hello Guys,

I am an Environment modeler, and I had a discussion with my level designer. He said that " I need to make stuff in clean number. For Example, If I am making a cube, it has to be in 1M in Height and Width. So he can use Grid snap" So the snap value will be 1M inside of unity because in unity 1 Unit = 1M.

Which I understand. And I am fine with it. But he refuses to use vertex snap, I asked him why and he said: "Vertex snap give a value of 1.9899(just example -not exact number) which is bad for the game engine in terms of programming issues and it is also a bad level design to have unclean numbers".

Unity created Vertex Snapping for a reason, to snap. It is just another snapping option to me. I see that there going to be an issue in a huge open world. But what we are doing here is a closed indoor environment.

Does this affect level design in any way?

Using Vertex snapping is a bad practice as he says??

If assets don't align using grid snapping, is it really bad to use vertex snapping??

So even if a real-world asset is 1.78 meter, should I have to round to 1.5M or 2M just to satisfy the need of Grid snapping?

Please throw some light here. I am really tired of this argument with people around me about this whole conversation. IF there a best practices guide, that will be helpful.

I also do understand the importance of Grid snapping when I do modular asset pieces or tilling assets. I make them in the increments of 1M grid's. But other than that I really need a clarification on this.

Thank you. SK