That's what test-installations are for. And given the known security issues in all vB4 versions below v.2.2 this seems rather short-sighted in my opinion. If you are a skilled enough admin to take that risk or fix the security issues yourself, then fixing the problems that come with an upgrade should not cause you headaches. If they do, then are you really that comfortable with known security issues? Of course, its your choice, but surely its not a way I would widely recommend.
Especially since the upgrade we're talking here, from 4.2.1 to 4.2.2, will hardly break anything.
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