Homebrewing has gotten better in the last 10-15 years. Just look at the resources that became available to homebrewers in that time.
I built a RIMS system 12 years ago. At that time they were pieced together, there was all kinds of information meant to dissuade a person from brewing on a RIMS (thin beers, hot side aeration, scorched wort, etc.). There wasn't a any RIM tubes available, so I pieced one together with parts from McMaster-Carr (I love that site). Controller? Gotta build it yourself. Now you can buy parts, premade controllers, whole systems ready to go from a box like the Grainfather. RIMS are very common now.
Some improvements are meant to make it easier, more convenient. Some just make better beer and easier to boot. Here's a few that I can think of:
- more yeasts are available, both dry and liquid. The dry yeast has gotten better over the years. Huge impact on quality
- more choices in grains and other ingredients from all over the world
- more hops and better packaging. Places like Yakima Valley Hops treat the hops better than some dude in a backroom of a homebrew shop stuffing an ounce of hops in a poly bag and sealing them with a hot sealer. No nitrogen flush, no mylar packaging, no date, no hop harvest year.
- devices like the Tilt to monitor live fermentation, better temp controllers, ready to go RIMS systems with tighter temperature control
- a variety of spunding valves for both pressurized fermentation and spunding in a keg and pressurized transfers
- a variety of stainless steel fermenters, conical, "bucket", modified Sanke kegs, etc. This allows for closed, pressurize transfers. No more auto-siphon and open air transfers not to mention spunding
- brewers are better informed. The internet has brought so much information to the average home brewer, it's astounding. Books about nearly any subject you care to know
- a lot of different brewing software, take your pick
This is just the stuff I can think of off the top of my head. I know my brewing has improved in just the last couple of years. I have been brewing for 16-18 years and competing for 10 years. I'm convinced that the beer I won golds for 10 years ago would not do as well today. There are so many good brewers out there, it's amazing.
So has quality of homebrew improved over the last 10-15 years? I believe it has, or a lot of these advances in homebrewing were for not.