Had to see a urologist at start of the year (not about this, randomly peed blood, it was nothing) but he asked how often I cum. I was like dunno pretty much every day I guess. He was like yeah cool that's fine
Then I asked how often you should and he basically said as long as you can get fully hard, and shoot ok without it hurting it's fine. So results will vary person to person. And your jizz gets replaced every couple of days anyway so there's no real benefit to not cumming.
Unless youre doing tantric training youre probably going to see negative effects because it's all muscles that you aren't using.