Not playing a high line with poor defenders, and with no counter-attacking game, is just another quick way to be shit. Because you end up just inviting pressure near your hot areas like crazy and we are not equipped to a) resist that for long amounts of time due to poor defensive ability in nearly all areas, b) pass around that heat because our movement is shit, c) play direct balls from defense to attack because we have nobody who can be a decent target man. Something many teams easily exploited against Ernie's Barca. Press our low block and the whole thing will collapse easily.
In the end, it's like dying by hanging or dying by the electric chair. Same fucking thing in the end.
If you play a high line, you keep the distance between the lines shorter (basically more men blocking the same number of opponents in a shorter space = more chances to control space and ideal for applying pressure), and you play farther away from your goal, as well as are more compact in key areas, making it harder for the other team to play its game. But you are exposed to runs in behind your defense, and with 2 turtle defenders, that's not good.
If you drop your lines closer to your goal, you either defend deep and compact in which case you need solid, reliable, disciplined defenders who make very few errors under pressure (since playing deep invites pressure), a good counter game to create clear chances (meaning speed and great transitions), good target men, as well as defensively solid players. That's a lot. Think of peak Simeone's Atletico or Chelsea back in Mourinho's days with an iron defense, iron DM (Essien/Makelele type), and an amazing target man in Drogba who is used to playing isolated and wrestles defenders for fun. Or you end up with a hugely long team, with sometimes 70m between defender line and forward line with lazy Messi and Suarez moving at their own pace with no regards to what the rest of the team does. Meaning a huge playing zone for the opponent with low amount of pressure.