Bug#33552 refers to -I not working which was already fixed by c3245083 before 271793f0. (c3245083 shows up before 271793f0 in `git log` although commit times are in reverse order).
With regard to Bug#29668: they can use `grep -s -I`. Their real problem was that `-I` didn't work. Now to the problems the change caused for me: Background: I have a collection[1] of find/grep commands all designed to be piped into `less`. They all use `grep --line-buffered` (since `less` to the tty will be line buffered), grep -s (to avoid stderr output which would mess up `less`) and `sed -u` (approximately line buffered as well). My distro is Slackware and most of the time I use the 14.2 bare metal system which has grep 2.25. So I didn't see the altered grep behaviour until I had a Slackware Current (15.0 Beta) VM. On the 15.0 VM I was searching in a build directory for why a program was complaining about a shared library it had no business using. So I searched via the `yfl` symlink (which "always" finds everything) and found ... nothing. Not even a binary match in the executable. I spent some time reviewing the `sfl` script before I twigged it was changed grep behaviour. (BTW the executable was the only match. I had left LIBS in the environment from something else I was working on). I could go on, but hope I have said enough. [1] https://github.com/duncan-roe/command_line_tools/blob/master/bin/sfl There are 21 symlinks to this script, for a total of 22 commands.