"They haven't done anything to make the line better on offense..." Hmmmmm
2020 - 3rd round pick Neville Gallimore, played in 35 games, started 14 games
2020 - trade up in 4th round to draft Center Tyler Biadasz - immediate starter, and Pro Bowl in 2023
2020 - 5th round pick Bradlee Anae, played in 11 games
2020 - sign and develop rookie free agent Terence Steele - widely considered an excellent run blocker (maybe the best on the Cowboys Oline) and developing his pass blocking skills. Top half Right tackle in the NFL in 2023.
2021 - 1st round pick Micah Parsons
2021 - two 3rd round picks for defensive tacklers Osa Odighizuwa (now a starting 3-tech) and Chancey Golston.
2021 - 4th round pick OT Josh Ball - now converted to OG since he wasn't working out at OT - though not for a lack of trying.
2021 - 7th round pick OG Matt Farniok - has played in 19 games to help him develop, and started 2 games in 2022.
2021 - 6th round pick on 1-tech DT Quinton Bohanna - played in 27 games and started 10 games in two season, including 9 starts last season.
2022 - cut loose La'el Collins in the offseason.
2022 - 1st round pick on OT Tyler Smith, started 17 games in 2022 at Left Tackle
2022 - 2nd round pick on DE Sam Williams - 4 sacks, 1 forced fumble, and 10 TFL in limited playing time as 5th DE on team behind Parsons Lawrence, Armstrong, and Fowler
2022 - 5th round pick on OT Matt Waletzo - spent rookie season on IR - ability unknown at this point.
2022 - 5th round pick on 1-tech DT John Ridgeway - plucked off waiver by Commanders when the Cowboys tried to put him on the Practice Squad. Started 4 games for the Commanders in 2022.
2022 - signed rookie free agent Alec Lindstrom ($12,500 signing bonus), on practice squad all season
2022 - traded for DT Johnathan Hankins (former 2nd round pick) from Raiders
2023 - signed veteran free agent Chuma Edoga - former Jets 3rd round pick to play OG.
2023 - 1st round pick on 1-tech DT Mazi Smith - expected to start
2023 - 4th round pick DE Viliami Fehoko - Cowboys expect to transition him to 3-tech DT.
2023 - 5th round pick OT Asim Richards - Cowboys expect to transition him to Guard.
2023 - signed premium rookie free agent OG T.J. Bass ($150K guaranteed)
2023 - signed premium rookie free agent OT Earl Bostick ($220K guaranteed)
2023 - signed premium rookie free agent DE Tyrus Wheat ($185K guaranteed)
So, in the last 4 offseasons:
Offensive line resources spent - one veteran free agent signed, 1st round pick, two 4th round picks, two 5th round picks, 7th round pick, 4 premium undrafted free agents resulting in a three new starting offensive linemen (Biadasz, Steele & Smith) - one of whom has received Pro Bowl honors, plus multiple backup players (Ball, Waletzo, Lindstrom, Edoga (former 3rd round pick), Bass & Bostick).
"They haven't done anything to make the line better on offense..." Really? 3 new offensive line starters in the previous 3 seasons, but "haven't done anything?"
Also, they spent 7 draft picks for Defensive Tackles (Gallimore, Odighizuwa, Golston, Bohanna, Ridgeway, Smith, Fehoko), and traded for another former 2nd round pick (Hankins). They are also giving Isaac Alarcon a shot a DT, who has formerly been playing on the offensive line.
They spent 1st round pick (Parsons), 2nd round pick (Williams) and 5th round pick (Anae) on Defensive Ends, and signed 3 veteran free agents including two former 1st round picks (Fowler, McKinley) and a former 2nd round pick (Benogu) to go along with starters Armstrong and Lawrence. They also guaranteed premium rookie free agent Tyrus Wheat $185K to sign with them this year.
I have to wonder what you expect them to do, if you think "they haven't done anything to make the line better on offense."