Just curiosity

Obviously they are just bitter, because they made the wrong choice!

Seriously though, B!Lyn and B!Veronica are just amazing units for lots of PvE content. That's not to say the others aren't useful (they certainly can be), but clearly B!Hector and B! Ephraim had arena in mind rather than PvE content.

Well, they're not wrong even if it's not a nice way of saying it.
Especially since picking a CYL character is one of the first things someone can do when they're playing Feh new. So a lot of people just pick something.
And picking a unit like Brave Ike and Brave Hector is totally valid even if you go in with all the knowledge

I assume this is supposed to be a F2P guide or something, and that's why they're upset. But to be fair, they technically are "free" units. You just have to pick them. It's definitely not worth getting bent out of shape over.

They are actually on the wrong side.
If they actually wanted to follow that kind of solutions, they should have follow the majority of the people.
those people that give f2p solution usually give out stuff like polls, or somekind of review on which unit he will choose, or will use as a F2P guide in the future, you should follow their choice.
It's actually your own risk to choose unit you like if you actually plan on using guide.

Seems fairly standard negative of a comment to me...

Carry on. (also yeah I never had Lyn but I did fine without her)

And even those that don't probably have her because she's been on something like 7 banners? How many people don't have B.Lyn?

I get where they're coming from. Lyn and Veronica may be the popular choices from their respective Brave Hero pick banners by a large majority, but not everyone wants/cares about them. It's understandable that F2P guides use these assumptions to make their guides since most people will get some use out of it due to their picks. However, it feels kind of rude to say "sucks to be you" if someone didn't pick a certain unit. The player shouldn't feel forced to pick a different unit over their initial pick just because some guide says it's they're best option, regardless of how accurate that statement may or may not be. Thankfully more dedicated guide makers like PhoenixMaster show different teams in case a player didn't make the popular pick.