no, they are not "terrible", they're not complex proteins - excepting eggs. you have to mix two sources of simple protein to equal complex. good, bad; whatever your characterization of them may be, that's the foundation.
you again seem to be conflating your ability to measure something with the method itself being good. I think it's impossible for us to say your vegetarian diet is healthy when you say it makes you weaker, yet you point to being predictably weaker as a sign of knowing what you're doing? I'm not following.
I never said it was unhealthy to forego meat, just that I have never found a non-meat source that can compete. I was vegetarian for 6 months, have done tons of 3-6 week vegan stints, keto, carnivore and others all while doing rock climbing training and tracking my performance. I am noticeably weaker and more injury prone on a vegan/vegetarian diet. I do 3-6 weeks of veganism to intentionally lose muscle mass and lower my overall weight.
People and the internet can say whatever they want about nutrition but it will be hard to convince me when I can accurately predict how much strength I will lose when removing meat from my diet.