I know what he means but that is not self spotting. Self spotting is the ability of certain units to see (almost) as far as their own weapon range so that they do not need other units to spot for them in order to fire from max range. For example the Command Panther and the Puma both with 50 weapon and 50 sight range, or a Pathfinders recrewed M2HB with 45 weapon range and 50 sight range.
Infantry Sections can not self spot by definition because the maximum range on any of their weapons is 35 which is the same as the standard sight range.
Being able to see further is not self spotting and does not give an as significant advantage. I don't want to start a semantics discussion here but self spotting is a clearly defined and powerful trait and it's important keep that separated from this discussion and stop randomly attributing things to Infantry Sections that aren't true.
They can see quite a bit further at vet 1 when in cover (45) which helps with reconnaissance and which helps to spot for HMGs and ATGs and other vehicles and that is quite powerful. They have it because they are tied to cover more than other mainline infantry and generally can't be as far forwards. Perhaps it can be toned down now. But it's not self spotting and a top player like Orangepest should know the difference.
I didnt mean selfspot, sometimes i mix up terms, the ability for every single mainline to have extremely strong spotting range is beyond powerful because on a map like faymonvile where you're going to be hugging cover 60-80% of the time.
It means that for example i place the typical sandbag center and will see... any coming flanks from the northern front, the point left from there, meaning any flanks will be spotted almost instantly, and the flanks from the truck point. Now i'll admit this might not be 100% certainty in terms of testing, but i find that to be the case frequently and it makes for nightmares trying to push someone who's playing defensivly because he gets all the chances to prepare and move around as he wishes while you have to constantly use sightblockers, it also works excellently for units with great range like vetted up vickers (in trench) or simply giving your vickers constant max range firewithout having to expose it self or having your sections move forward that much more.
I think you are very heavily (maybe delibaretly.) underplaying the power of having your mainline infantry get amazing sight range. its partly why pathfinders are as powerful as they are, sight is a great tool. Which is why it's assinged to certain vehicles that come out early rather than later, having your tanks the ability to fire max range almost always is a great boon.