To be clear: we talk about those tags that only have a name. No priority, no level, no event name, nothing, just the name. If you're not sure why these tags are bad, read Drop all Service Tags in Your Nette and Symfony Applications first.
I'm very happy to see that collectors are finally getting to the core of DI components of PHP frameworks. Tags, extensions, compiler passes and
autoconfigure now became workarounds. Collectors are now in the best place they can... the PHP code.