I don't think adblocking is a petty form of theft, I think it's prudent, as ads are often security risks - not to mention don't include proper privacy settings but still try to track you against your will. Which is illegal in my part (EU) of the world. I'll try to support in other ways if I think your content is worth it and you provide secondary ways to pay.
I don't see the nostalgia aspect either. Shows were only "designed for it" in such a way that they frequently take breaks from the plot to show ads,. I challenge you to point to any single show where frequent ad breaks actually made the show better.
If you feel like Netflix shows "drag out", that sounds like an attention span issue. The same episode is either much shorter without 30-40% more time being spent on ads, or it's the same air time and just has more actual episode.
Not ads, but the best example of a dramatic interruption are the first two seasons of JoJo's Bizarre Adventure, where the hero is screwed and then it cuts out into the Roundabout song. This is a lot less dramatic when you can just binge watch things and don't have to wait a week for the next.
Whereas Netflix shows tend to fill it with fluff, things like side drama, background stories, and redundant plot elements. I know I can skip the ad, but I don't really know if I can skip story details. I end up watching something like Squid Game on 2x speed.
Stealing from a company that has already charged you a subscription fee might be ethical. But I don't enable adblock because it also means I'm stealing on autopilot from other sites that I may want to support.
By this rationale you should also feel obligated to buy everything that everyone advertises to you, since they paid for the ad specifically to get you to buy.
There are models where they pay per download and pay per purchase, but as long as they're not doing that, you're not obligated to do those things.
You don't owe the advertiser anything unless they're paying you directly. You owe the content creator (a youtube channel) and the content distributor (youtube).
The advertisers are aware of this and it's calculated into their rates. If it's an attentive view, the rates are much, much higher.
Good product is ad by itself.
AdBlockers just saves a lot of your time and keep you sane during content consumption.
Also adblocking does reduce some experiences. Some sites will tell you to disable it, and that's more irritating than the ad banners.
I had conversation with my daughter on how games used to have no ads but now they're chock full of ads, but TV has no ads now but up to a third of TV was ads when I was her age. I think there's a bit of nostalgia to ads, that some shows were designed for it. Even if it's those dodgy Evony ads. I can watch Futurama without ads today, but it feels like something's missing. Netflix shows drag out, maybe because it's missing the "grind" of ads?