Of course it doesn't matter it's your quilt and you can do and use what you like, that is why there are so many unemployed Quilt Police
I used to use the poly covered thread about 10 years ago and my quilts are still going strong I have changed to Aurifil because I wanted to as my quilting has changed but I would still use that poly covered thread if pennies demanded, so enjoy your quilting and forget about the quilt police.