Well, I DID say that I don't think what they're doing will work. Of course, that's only if you're talking about adding the Generation VII Pokémon alone. Currently, for instance, Mega Pokémon are not allowed in VGCs, and Pokémon that can't be found in Alola are not allowed, which are bigger factors in mitigating Speed creep than the new Pokémon themselves. But I feel that Game Freak should've done more, as these only apply to one part of head-to-head play and nothing has really changed except restrictions. They've done nothing to disincentivize using fast Pokémon. In other words, I am not disagreeing with you about competitive players ignoring most of the new Pokémon, as that was something I had predicted since the base stats became available (well, the Spikes anyway--I'm sure the Timmies and Johnnies love them, though for different reasons). I am addressing the question people are asking about why so many of the new Pokémon are so slow, and I have provided the best answer I can come up with.
I do like that you've offered some suggestions as to how to solve this problem. I've been trying to come up with something that could work that won't break something else, but it's been quite difficult, as there are so many moves, mechanics, and Abilities centered around how it presently functions. The best I can come up with is to modify damage output to be inversely proportional to a Pokémon's Speed, or give a damage bonus/penalty based on who moves first, second, third, etc., though that will throw certain Pokémon off whack, with the likes of Accelgor and Electrode on one end and Snorlax and Mega Camerupt on the other. (I don't really see how adding a small amount of new Pokémon slow but bulky would reduce Speed creep. Logically, wouldn't adding in a large amount of them reduce it more?) Another possibility, as so many of the new Pokémon have unique Abilities, is to provide increased benefits for them later on (such as Fluffy also halving special attacks, Water Compaction granting immunity to Water-type attacks and sharply raising Defense, Comatose providing steady healing while giving Komala Slack Off, Queenly Majesty and Dazzling blocking all attacks from Pokémon over a certain base Speed, etc.). This is something I predict they'll do--it's possible they're "testing the waters," so to speak, and buffing the ones that didn't work out later on. Toxapex has already proven itself, for instance, so Merciless will certainly get skipped when handing out buffs.
I also don't fully understand your last statement. Strictly speaking, what is the difference between "defending an argument" and "finding excuses"? Are they not synonymous, only from different sides of the argument? (For the record, I find it meaningless to attack a particular viewpoint without first understanding why the people on the other side think the way they do.)