Ok Rupert I ask you this, do you consider 2 snipers + m3 -> guards -> callins vs. OKW (and even ostheer partly) a fair and balanced strategy, or would you consider it exploiting a hole in faction design? There is a difference between using units in an effective way that allows you to gain an upper hand, and using a few units that are meant to support your core army as a mainline infantry unit because your enemies have no counters to said units. If you assume that this is a fair strategy, that throws out just about every argument against units that are/were obviously overperforming for cost in the meta, such as the ISU and the Jagdtiger.
As for your second point about lenny, he does a great job and more people should watch his twitch channel. However, to use his 7 conscript build, he is frequently forced to spam sandbags to disrupt vehicle pathing and generally have an extremely micro-intensive playstyle that most of the playerbase will not be able to pull-off. Even with his love of conscripts, lenny still falls back on more regular tactics (conspam into callins) when he is having a hard time winning.
just because people play the game differently than you would want them to doesnt make it unfair or an exploit. soviet t1 + callins has been a tried and tested strategy, and its one of the many viable strategies that the soviets can play. competitive games are all about min/max, so you really shouldnt bash people for using strategies that are most optimal to the way they play.
while its true okw have a really tough time countering snipers, there are a variety of really soft counters that they can use to maybe kill them. luchs, obers, stuka, JLI/Falls, and most importantly using line of sight and flanking. however it really is up to the player to use game sense, their own personal skill in executing an operation, and a little bit of luck.
i would hate to see this game turn into a game where theres only 1 or 2 builds that really work because people expect that kind of game. its always good to have a variety of options available even if the player base may think it 'cheese'.