I agree in regard to what others have said. There are a lot of people on here who have a wealth of insight. Those mentioned for sure. Several of the folks on the "Brew Science" sub forum have entertained my countless questions. Many recipes provide for tried and true starting points. When I started brewing, in the mid-late 90's, accessing info on the internet was just becoming convenient and possible. I can't imagine figuring everything out on your own.
That access to information has increased over the years, and the information I have been able to access in the past 5 years or so is just mind-blowing compared to when I started. I would say the first 75% of my homebrewing "career" I turned out marginal to "ok" beer at best. The information I have gathered from folks on this, and other, forums has allowed my beer brewing to improve many times over.
Your post did make me wonder about how many brews I have done.... I never kept particularly good notes until 2012, when I started using iBrewmaster. No idea how many I have brewed total. Pretty sure I don't want to know. But, since April 1, 2012...... I have brewed about 125 batches of beer....
Wow..... I need to get out more.
But, as mentioned - what does brewing a lot really lend? In my case, I am sure I have 100-200 batches, over the first 10 years I brewed, that really did little more that reinforce previously bad habits and processes I had from the beginning. Those 100+ batches did not make me any expert, or fit to give advice, that is for sure.
I guess, in hindsight, they allow me to recognize errors, mistakes and struggles beginners encounter - because I have personally made each of them dozens of times over. Thanks to sites like this, I figured out my major errors and problems. There are still so many details and areas of expertise out there though - It is hard to imagine ever knowing it all, that is for sure. There is definitely a wealth of knowledge here, and sites like this, podcasts, books, etc really can eliminate years of "trial and error."