Combine a defense that forced only 22 turnovers (27th in the NFL) with an offense that was 30th in 3rd down conversions gives you a team not capable of driving the length of the field, but needing to do just that to score.
A revamped O-line and more maturity as a whole should spell a major improvement in 3rd down conversions. Better pressure on the opponents QB should raise the turnover totals. The Texan FO has attempted to answer these weaknesses this offseason. That's all we could have asked from them.