used when you make a comment or criticism, so that it seems less severe or is less likely to offend someone

All I'm saying is I think the end part could have been a little shorter. 我只是觉得结尾处可以稍微短一点儿。

We should do our best, that's all I'm saying. 我只是觉得我们应该尽力而为。

All I'm saying is that we should be given both sides of the argument.

Too many of these ideas aren't based on logic is all I'm saying.

All I'm saying is that we don't yet have enough evidence to make that claim.

See also: all determiner predeterminer pronoun