It does change the dynamic quite a bit the 3 going through. For example, Spain would’ve 100% been through after 2 games because of GD, so could rest the whole XI and not care even more if they wanted to.
Does still give sides that going into final game some hope of going through, as 3 points will be enough on some occasions if GD is horrendous.
Costa Rica when it got to 2-2, then wouldn’t for example had to then push on more, they could go back to sitting back (even though it made no difference, they was actually better when they stopped trying to park the bus )
I thought I wouldn’t be a fan of three going through when it came to Euros, but I like it, and mixes things up for knockout rounds too as a result.