Tech Investors hate LLCs cause they hate K1 forms.
Unless you know day 1 you are going to get investment (like, that is your entire goal of your business - say you already have ycom ready to invest), I still contest you should almost always start LLC. If say you putz around and bootstrap for a year, your taxes and accounting and everything else will be SO MUCH EASIER for the first year. Then sure, if you light on fire and need investments from traditional VCs, cool you can convert. What % of random startups founded on hacker news get to the point of VC investment? My gut would tell me 10% or less, but no idea how to measure this.
But when do you bring on employees? ie non-partners. I hugely recommend giving them equity options and now you have to convert, which is more costly than being a C corp from the start.
Also your 10% figure isn't close. investment comes from family, angels, and VCs. Probably over 50% get some type, and now your tax returns and theirs just got much more complex. As does future investment.
If you can afford to start as a C corp, it's often worthwhile.
I am not giving early employees equity, going market rate salary instead. But you can totally issue shares as an LLC though. In fact they are more flexible. You could add more rules or regulations around it.
Investments from family and angels do not need to be equity, it could also be various debt instruments. In these cases no tax magic to worry about, it stays very simple.
Perhaps my boat is different because from day 1 I was 90% not planning to get VC money. If your plan is 90% from day 1 to get VC money, then I guess you would want to optimize that path.
