While anecdotal evidence is the worst quality possible, it displays the contrary.
Last season, between 12 and 20 promotion series for S1 to G5. In just about every single one of them without fail, my team would consist of a few silvers incl me and we'd have 1 gold at the very least most of the time. The enemy team would generally consist of mid gold-plat5 and in 11 games (out of, at the bare minimum 36 games) the enemy team had someone in diamond.
Regardless of the situation, there should never be anyone above gold 3 on the opposing team. I don't care about their MMR, if their MMR sucks let them sink down to the actual rank instead of "well he has the win rate of a silver so we'll stick him in a silver game".
The test should be silver 1, vs S1-G3. Those weren't promos to plat, they weren't promos to diamond hell I doubt I'd make it to high gold. So why on earth is the test silver+low gold need to beat gold-diamonds?
What generally happens prior to a promo? Generally you're on a streak (potentially 60%+ winrate in the past 10-15 games) or at the very least over 50% (2 wins 1 loss 1 win 1 loss 2 wins 1 loss ect). Then, and again anecdotally, hit promos, and every enemy team member is better than every ally team member.
I got through, due to free wins. It felt shit, the enemy team had someone inting and yipee, gold... practically for free...
I'm not making the claim that the system works like this, but it is odd when a trend like this is so dam obvious. I'm simply pointing out said pattern.
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What is interesting is that this season was drastically different. One series is all it took, won 3 lost 1 so was pretty clean.
Why was this one so easy, when the last one was so hard? I hadn't played in a year (got sick of meta and took a break) so I should've been way worse than I was last year. Yet it was so clean and simple this time.
Idk what they've got going on, maybe sheet changed idk. But if the system does feel more artificial than the sc2 system (where you do literally climb until the enemies are too good)