I enjoyed the post and appreciate the author sharing their perspective. It's one of many valuable datapoints for anyone considering such a transition.

I agree with a lot, but like others - disagree with some.

My background: I've worked in tech for ~14 in all kinds of roles - from pure junior IC, through a "team lead" (something between an expert IC, a tech lead, and a manager), "tech lead," company's "technical architect" (highest level tech lead, peer to the technical director, but without any direct reports), and something akin to a tech director. Now I'm back to IC. Companies from small gamedev ones (80 people total, 15 engineers), medium gamedev (30 engineers and coding technical artists), huge gamedev (Ubisoft where you can have 100+ engineers and 1500 people total on a project), and for the last 7y "big tech".

The idea I would like to push back the most is that "your words have more weight". I have never had trouble getting my opinions heard, even if I didn't push them. Being the expert IC and "problem solver" sometimes I'd have even CEO asking me directly for advice and how to solve some issues (both technical and non-technical!). Not always following them, but I didn't expect that.
Having an official title, in theory, you can use some "authority" to formally push those ideas.
But... in practice, it does not work better. People will still go directly to the most technical experts. And if you abuse the position/authority/title (I hope I never did that, but that's not for me to judge...), it can cause resentment, pushback, and more disagreements.
You will also hear less of gossip and honest feedback, to some engineers you becomes "not one of us anymore".

It can also destroy friendships. I had a great friend (meeting socially with our wives once a week, sharing interests) who was my peer and was then promoted to my lead. I still really liked them and wanted to stay friends. We always had technical disagreements (which were fine for peer ICs).
Later, some of those technical disagreements and my bringing up issues publicly caused him to get bitter with me (as the upper management saw those and took my side on some occasions), and eventually stopped the friendship completely; after I left the company, they started ghosting me. :(

Similarly, on a few occasions, I agreed to lead/manage formally (in one case, it came from me - in other cases, I was asked to). I agreed because I thought, "Things are f-d up; I can solve them by being closer to the upper leadership and helping the team succeed." Man, I was so naive. :( I didn't have any more authority or power with the higher-ups, and there were more disagreements. They expected me to enforce policies I disagreed with.
As you can imagine, this didn't last long, and I always ended up leaving the team/company and being super burnt out.

So now I'm happy to be a staff-level IC, an expert, and a "hacker," playing with problems hands-on and building my expertise further. The field grows so quickly that there is always something exciting and new to learn and do.
I would happily be a tech lead of some project close to me (luckily, at Google and similar, it's flexible, per-project, and not formal), but I probably do not want to manage again. Maybe it will change, depends.