OK, I've got a bit of history with Tandy. I managed their stereo concession in Macy's/Bambergers in 68 - 69, Worked part time in one of their red/white stores going to school in 76 - 77, again, in 81 - 84 going to computer school and finally part time for kicks in 97 - 99. I've pretty much seen their rise and fall.
My first incarnation was before the ubiquitous stores invaded malls and they just bought out Allied. I sold a few of Allied receives but no real Realistic stuff. Atl that this concession sold was brand name stereo. In 76 it got interesting. Their stores had started invading the malls and their full line was quite extensive. To say they sold junk is a bit disingenuous. I wish I had a nickle for evet OTA antenna installation I engineered. I musta sold hundreds of CD sets, both mobile and home sets. As for stereos. they did not suck. The speakers were as good as what was out there but a bit more expensive than the competition but, when the 2 for 1 sale hit, the were an unbeatable bargain. Likewise their components. Generally quite adequate but a few standout sstill come to mind. The STA-90 and STA-200) spring to mind. I personally preferred their Nova series to the Machs but that's a personal preference. They played to different audiences. I don't know how many flavor radios I sole, not to mention PA systems to churches.
In 81 - 84 it was fun. TRS-80's gave my my start in programming, where I spent most of my career. Their stereo lineup remained basically the same but they pretty much started the mini component sthick with the STA-7 and 10 (I think) and brought the reasonably priced Minimus 7's and to the market.
At this time, Ma Bell was put to pasture and many people were jumping to buy their own phones. And everyone was jumping to sell whatever they could, including the shack. This is where one gets what they paid for. You could get a one piece phone for $11.88 and it was unmitigated junk. I know. I has two. But, they did work. There were more expensive phones but nothing spectacular. Cordless phones were good sellers too. Again, some were better than others, but this goes for everyone, not just the shack. Their Christmas toys were a gas, and a great seller. We spent hours on the parking lot with the RC cars. By 84 I finished school and went to work in the real world but I kept contact with the friends I made there.. Their xx in one lab kits gave lots of kids a good start in their electronics training. Oh, let's not forget the table and clock radios that were always in demand.
I went to work for a buddy i '96 part time in his store. Now, the decline was obvious. Their electronics had dropped a few pegs in quality and they were in bed with RCA here. They were now pushing cell phones and still pushing their computers when they should have jettisoned them years before when the PC's took over the market in the late 80's. The internet market was just starting and people were buying less and less in the B&M stores and their sales were far and few. They still had the parts rack but few people were interested in this any more. In the 80's, these were a major draw but there was little interest any more. OTA antenna sales were down because a lot of people fell under the thrall of cable.
The market had changed. They simply didn't change to keep up with it. Prices on brand name stuff could be gotten mail order and in local B&M stores. Up to the 90's the had a fine product and fair pricing. They just zigged when they should have zagged and lost their competitive edge in the 90's and is was a quick slide into the morass.