Does being quiet actually hold your career back?

Twenty years in heavy equipment design here and I'd say the quiet-but-reliable route works, but slower and it caps out earlier. I was that guy for most of my career. Solid models, clean drawing packages, rarely spoke unless I had something useful. My reviews were always fine, never glowing. The engineers who got the fun assignments were the ones thepm could picture putting in front of a customer or a vendor.

What changed it for me wasn't becoming a social butterfly. It was small stuff. I started giving a two minute summary in design reviews instead of letting my work speak for itself. I started asking the technicians on the floor how the last build went, which sounds obvious but most engineers never bother. Turns out the assembler who hates a certain fastener pattern will tell you exactly why your design is annoying to build. Here's the honest part though. It still annoys me that this matters. Technical skill shoud be enought and it isn't. The guy who got your automation spot probly would have gotten it anyway if he were also the quiet type, but being liked removed any doubt in the manager's head. Likeability is basially a tiebreaker that gets applied way more often than anyone admits. You don't have to change who you are. Just make sure the right people actually know what you've done, because right now your lead might be the only one.

I'd push back a bit on the idea that the quiet route caps out early. I spent eleven years at a conveyor OEM doing exactly what you describe, heads down, clean releases, and I still ended up running our retrofit side. What got me there wasn't small talk. It was being the guy who answered the phone when a line went down and who wrote things down so other people coud act on them. Here's the reframe I'd offer. Likeability on the shop floor mostly means 'low friction.' People don't need you to be funny, they need to know you'll respond, you won't get defensive when your design gets questioned, and you'll give them a straight answer fast. I built that reputation entirely through written status updates and showing up to commissioning weeks even when they were miserable.

The one thing I did change around year six was saying yes to the ugly travel. Customer sites, install support, that sort of thing. Turns out a week on a plant floor with someone builds more trust than a year of lunchroom banter. If being social drains you, pick the version of visibility that costs you less.

So no, I don't think you need to become a diferent person. You need one or two channels where your reliability is visible to people beyond your lead. That's a much smaller ask than performing charisma every morning.

Honestly I think people mix up 'likeable' with 'extroverted'. I'm not chatty at all but I've never had trouble getting good projects. Turns out just answering people's messages same day and not getting defensive when someone pokes holes in your design does most of the heavy lifting. My old supervisor once told me he picks people he doesn't have to chase, and that stuck with me.

So maybe don't stress about jokes in the morning meeting. Just be the easiest person on the team to work with and you're 90% there.

Funny reading this as someone with the opposite worry. I'm only about a year into my first job after switching over from working service tech jobs, so chatting with people comes easy to me. My problem is I worry everyone assumes I'm all personality and no substance. Like I got friendly with the shop guys fast and now I catch myself wondering if that reads as goofing off instead of being useful. Did anyone else find that being too comfortable with the floor crew ever worked against them? Maybe I'm overthinking it the same way the OP is, just from the other side.