I understand that and also agree with it.
But on the other hand, why should M+ players benefit fron being able to simply purchase what are effectively myth track items after half the season, while the Raider is still only ever guaranteed a hero track item for countless hours of engaging with content he may not enjoy… unless ofc he continues to spam m+ for the entire season in hopes of the slim chance of mythic vault drop of 1-2-3 out of 8 or 9 dozen items?
Not to mention that RNG is an evil mistress, spammable or not. I for example spammed Mecha:WS daily and who knows how often for at least 2 months last time it was in the pool, literally until I just couldn´t stand to run it anymore, and still never once saw the bracers as a drop OR in my vault. Last time I owned them was in BFA. And it annoyed me so much that I didn´t even want to log in on my mage anymore that season (SL S4), but rerolled to Warlock instead.
Because that is, for raiders, still EXACTLY the sort of “forced to run other content” system that M+ players as well as Blizzard themselves are supposedly trying to get away from, is it not?
I mean, When and how do raiders get their 100% guaranteed myth track BiS items from M+? Because currently, they don’t, and never have. Yet the M+ runners are still the ones complaining about having to run the raid for 1 let it be 2 hrs a week, while the raider still has to run 8 M+ 10s or higher, spending ca 4 hours, just to play the slot machine called Weekly Vault for a ~3% chance at seeing the item they want… statistically, you would need longer than a season lasts (34 weeks) to semi guarantee one Myth track BiS item in your vault (which is ignorant of how RNG percentages actually work, but the way they actually work is in fact even worse, as the calculation is logarithmic… the Probability of no success in N attempts = (0.97) to the power of N, which means even if you had infinite attempts the chance of success will never reach 100%…3 years of weekly vault openings still has a ~1% chance at never seeing the item ) 
Now, If we remove myth track items entirely, from both raids and M+ vaults, then it becomes a more level playing field under the current system, and more easily attainable for both sides. Which is one of the primary reasons why I still feel that Myth track should not exist at all and Mythic raid drops should be cosmetic or maxed out hero track only 