Not everyone/everywhere has/is, a perfect environment to grow. Beneficial insects do not always win the battle, indoors or out.
These are two things learned over many years of pain.
Healthy plants beat pests. Great, but what makes the healthiest plants? That’s where the rubber meets the road so to speak. Research is key, but nothing replaces time with hands(clean) and eyes(wide open) on the prizes.
All that said, and truely anecdotal, for me - a litlle PB and neem oil go a long way to easing my gardening anxiety.
Lastly, there are not enough parasitic wasps on this great green Earth to cull all the CATTIES! So, without BTT, all my crops would be toast every single time.
So, spray, don’t spray, it’s all about what works for your situation.
oh, and @vernal sux ;), lol…jk vern, don’t really know ya, but i certainly send positive vibes your way 