Business decision - bottom line counts.
"Amortization" of cost and profit "Maximization".
Test the SLK 3.0 V6 against with the heavier BMW new 328 2.0T or Audi TTS will get the answer
Totally outclass if use SLK 350 against BMW Z4 35i or Audi TTRS.
No worries, MB is already working on FI engine for future model usage and now they only can play catch-up.
Me also like old school but the world is revolving ain't wait for anyone.