If the client does not not care, why suffer by using something that is worse for you? I mean, you might as well use something that you like.

I don't get the logic here.

Another thing is that, if it it worse for you, it is automatically worse for the client. I am not sure why it is so hard to see. if your tool is bad, then your work ll suffer, and thus the client. So it is worse for them also..