That's not an excuse is a reality. Look at every 2024 playoff teams WR's and tell me who the Ravens were better than:
MIA: Tyreek, Waddle
Hou: Collins, Dell, Woods
Bills: Diggs, Davis, Shakir
Det: St Brown, Williams
SF: Deebo, Aiyuk, Jennings
TB: Evans, Godwin
GB: Doubs, Watson, Reed
Pitt: Pickens, Diontae
CLE: Amari, Moore
PHI: AJ, Devonta
Dal: Ceedee, Cooks
LA: Kupp, Puka
KC: Rice, Watson, Mecole, MVS
Only maybe KC wasn't clearly better but they're deeper and Mahomes is better than Lamar.
Bateman is a bust. Agholor isn't reliable. What did they add? They didn't even need to get a top 5 WR. There were free agents available who could've added production so you get enough depth that you improve your passing game.
Did Lamar play great against KC no, but neither did Mahomes in the second half. A little more firepower would make things easier for the offense. It was a heavy dose of Zay Flowers and his fumble was the turning point in the game.
KC was the best defense in the playoffs. Why wouldn't you want as much firepower as possible? That's what every team was doing.