Optional syntax is a popular feature in recent languages (or really recently popular languages, some of them have been percolating for a long time). Some languages also make parenthesis and commas optional for invocation allowing for "function arg arg arg" and sometimes even "object method arg arg arg" syntax. Optional end of line marks show up couple of places. So far all of the cases where I have seen optional constructs like this include at least one gotcha case where omitting or including punctuation are both meaningful but different.
I'm not a big fan. Optional syntax introduces a choice which allows me to avoid a cost. But the cost is tiny - typing parentheses and other delimiters takes very little time, and reading a language which uses delimiters is not hard. And the cost of making and in that one gotcha case mis-making a choice is notable. Programming productivity is limited by how many good choices you can make in a day, not by time or lines of code. I would prefer not to spend my choices on punctuation.
The end result, familiar to any C++ shop, is that you have to decide on what parts of the language you are going to use in your company so that you can stop making pointless choices and keep your code uniform and understandable. Only in this case it's not libraries or template tricks, but commas.
The argument I usually see for this sort of thing is that it allows the programmer to be expressive, which is a comparison of coding with painting, music or creative writing which is more harmful than useful. You've probably seen some code written in a James Joyce style and do not consider it a masterpiece like Ulysses.
There are a few recently languages that have gone the other way. Python (not that recent any more I suppose) goes somewhat down the line of syntax more rigid than the standard with its significant whitespace, and Go goes even farther which even formatting being part of the language. After initial suspicion about that I very much enjoyed Python and I suspect Go might be similarly satisfying although I haven't yet had the change to work with it.