That would be a very silly reason to buy a new tripod! I did fine with my Manfrotto 190CXPRO4 for quite some time (although I did swap the 488RC2 head I started with for a 468MG head with a Wimberley clamp for Arca plates – more stable and no play).
I bought the expensive RRS TVC-33 legs (along with a gimbal and ballhead) only after getting the 600/4L IS II. I had planned to keep the Manfrotto setup for travel, but once I started traveling more, I switched to the RRS TQC-14 + BH-30 LR because the latter fits in a carry on hard case, whereas I had to remove the ballhead from the 190CX to fit it in.
Honestly, using a tripod at all probably makes you look professional, or at least serious about photography, if that's important.