I feel like I rip open a liquid yeast pack an expose it outside the fridge it’s going to be impossible to keep some of it for the next batch.
Well, you don’t exactly “rip open a liquid yeast pack”. They are sold as pitchable yeast and are meant to be used entirely. You carefully cut off a corner with sanitized scissors and dispense the whole package.
That said, they can be split into 2 or more starters if you make some starter wort and put it in sanitized beer bottles with airlocks.
If you don’t want to split starters you can also re-use the yeast from a previous batch more than once with careful planning. Go from light to dark, weak to strong just like judges judge beer. For example, start with a blonde ale, re-pitch that onto an APA, and when that’s done re-pitch again onto an IPA. 3 beers from one liquid yeast. If you want to go further, re-pitch again even onto a barleywine or an old ale.
When I started many years ago, dry yeast had a bad rap. Much of what was sold were canned kits with a small packet of dry yeast tucked under a plastic lid on top - and everything said the first thing you do is throw away the dry yeast that came with the kit and replace it with a good liquid yeast.
Nowadays, dry yeast has come a long way and as previously stated there are now many good strains. But you can re-use liquid yeast the same as you can re-use dry yeast.