I don’t watch TV very much nowadays. There’s so much rubbish on.

[kadioguy]

I don’t watch TV very much nowadays. There’s so much rubbish on. It’s not like it used to be.
https://dictionary.cambridge.org/grammar/british-grammar/nowadays-these-days-or-today
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a. I don’t watch TV very much nowadays. There’s so much rubbish on.
b. I don’t watch TV very much nowadays. There’s so much rubbish on it. (my version)

1. Do both work?
2. One reason I can think of why the "it" is omitted in the original is that there would be too many its if the "it" was kept. Do you agree?

 

[emsr2d2]

Yours is understandable but the final "it" is unnecessary. It has nothing to do with how many "it"s it produces, although three in a short space does sound a little odd.

 

[jutfrank]

We customarily use just 'on' to mean 'on TV' when it's clear what we mean.

What's on?
There's not a lot on tonight.

 

[kadioguy]

A friend told me, "If you add it at the end, it kinda sounds like you're referring to your TV set."

I'm not sure if I should agree with them. What do you think?

PS - What confuses me is whether the it is optional or it should not be added.

 

[emsr2d2]

I disagree with your friend. For that meaning, you'd say "I don't watch my TV much". However, the rest of it wouldn't make any sense after that because it implies that the shows on your TV differ somehow from the shows on everyone else's TV!

Adding "it" at the end doesn't make it ungrammatical but it's very unnatural.