As someone else mentioned, pulling up by the roots just puts mud into your mushroom bag. This mixes in with all the edible parts and needs cleaning off later. I just slice off with a knife at ground level. The thin-stalked trumpet chanterelles I nip off with my fingernails.
It's slightly different with morels, leaving visible cut stalks is akin to saying to others " You have just found a top spot, come back next year for a bagfull, be sure to leave none for me". Morel locations are jealously guarded over here...
I find plastic bags fine in autumn when it's not too hot, a lot more practical than a basket when mushrooming on steep slopes, and discreet when you don't want anyone else to know what you're up to ( see previous comment on morels...) My partner uses a basket, but rather because it's the traditional method than to help with spore spreading.
Very poor morel season here this year, too dry, we found six yesterday where we should have found sixty. But I did get a good crop of cramp balls as well, so it was all worthwhile.