Its not that I know better lol. I have learned a lot through studying system, reading committee meeting pdfs, (I skim them unless something catches my eye that I like. They are wild long lmao) and from touring the system as a hobby. You live, you learn, you grow. There is always more to learn, and we all have to be open minded to it. Not everything will be correct, but we have to learn to differentiate what makes sense and what doesn't, and why such things the MTA does/doesn't do are the way they are, and remember to add a mix of common sense. That's all lol.
A thorough clean can change that. Like anything that needs maintenance to run optimally, over time it needs a bit of TLC. Hopefully the Deep Cleaning Program can encompass the entire fleet, and in the future, it gets rolled into the SMS program for subway cars. Plus, once the R211s come in, the R160s will be outdated lol. Are you going to dislike them then too? When the 68s were built, they were built for the needs of that time in the 1980s. They still serve them well today, just not as well as other cars (dwell times are higher with them compared to 60' cars). Still, they serve there purpose, and will continue to do so for the next 10-15 years.
With the amount of signals you can see on the L from Broadway Junction to Livonia Av, I doubt its one big block. It also means there would need to be a 10 min gap in service, which I know is untrue, as I remember one day I got off at Canarsie Rockaway Pkwy and a 32 was pulling into Canarsie yard like it was running right behind. It only happened once, so I'm not sure, so someone who has inside knowledge would need to clarify further.