Since OP is based in DAL, I think they can likely get to most of the Southwest network on direct flights, so the "useless A boarding pass on a connecting flight" problem may not be as big of an issue (of course it depends on one's individual flight patterns).

A lot of people use Southwest credit cards to get Companion Pass, as the bonus points and everyday spend points count towards that (but do not count towards elite status). So if that's a goal, the credit card might be worthwhile. The cards don't have much in the way of on-board perks though.

If you're looking for better seats/better boarding number, you might be better off trying to attain A-List status, or individually buying early bird check in ($15-25) or an A1-15 number at the gate ($30-50). None of the credit cards give you that automatically for every flight. I believe the Priority ($149/year) gives you 4 free upgrades to A1-15 at the gate per year. Not sure that's worth it though.

A-list usually requires 25 one-way flights (a flight with a connection counts as 1 flight; a roundtrip counts as 2) OR 35,000 tier qualifying points (TQP) (which are spend based). This year due to COVID that's been reduced to 15 one-way flights OR 20,000 TQPs. The Premier ($99/year) and Priority ($149/year) give you 1500 TQPs for every $10k in spend, up to 15,000 total. If you're putting that much spend on the card and trying to qualify for status via TQPs, I guess that could be valuable.