The advice you are getting seems reasonable to me, Spongegirl.
I would really have a hard time crowding my peas just by my lazy approach to planting. I don't plant in a wide
row but I'm only willing to struggle to get so many conventional rows in a bed and bend over so long, sprinkling a seed every so many inches . . . .
In general, gardeners are into nurturing - it isn't in their nature to willfully rip things out
of the ground! Still, you aren't doing a plant any favors by allowing its neighbor to crowd it for sunlight, water and nutrients. Stunting the whole lot of them isn't a nice
thing to do either!
The tendrils of probably all the pea varieties are tasty eating. I grow snow peas every fall just so that I can enjoy having the tendrils. There's a possibility that I will also have a few pods before hard frost but . . . the pretty flowers are fine to eat, also
Some folks sprout pea seed for eating -- I've no doubt that pulling seedlings, if'n you really have a concern, and running off to the kitchen with them would be a wise thing to do
. But, don't be afraid to thin seedlings -- lots of your garden plants will really appreciate you doing so.