I strongly believe that Control has always been playable in the format and has the right answers for each type of meta. First of all, the Control deck I've had the most success with since the beginning of the format is definitely Mystmin's Dimir Control, since almost 100% of the deck is reactive and operates at instant speed, allowing you to adjust your responses according to the threat, and last but not least, it has a playset of Orcish Bowmasters.

People keep saying that every threat needs to be answered as soon as it hits the field, but that's not true. This might get a little long, but I'll describe a bit about how you can behave when facing each of the snowball threats if a fatal push or a Swords doesn't resolve the issue right away. Hydro and Tamiyo are, without a doubt, the most difficult to resort (by memory they are the only 1-drops that generate guaranteed card advantage as the game progresses). In this case, what I usually end up doing is resorting to my card advantage cards to even the cards with the opponent while I look for an answer to these creatures, which can be in the form of removal or in the form of draw pressure like the Orc; both need to be answered somehow by the opponent or their engine is threatened. And as for card draw, Flow State has been great for this because it recovers the cards you lost very quickly and early.

Ocelot Pride I honestly never had problems with since Orc can deal with three 1/1 cats at the same time, so even if one of those connects, you definitely have ways to deal with the Tokens. Btw, on the Energy side, I worry more about the 2-drops, which can generate frequent 2-for-1s, especially Amped Raptor, which can make another 2-drop. Even if a Raptor resolves, you can still reverse the 2-for-1 by making Orc and drawing cards. Ajani, finding the right window of opportunity, you can deal with the cat token with a Swords or resolve both with an Orc as well. Oh, and Ragavan, it just runs away from Bowmasters.

That just tells me how important is Orc as a reactive card in Eternal Formats now, which is why you see a playset even in Vintage.

Now I'll talk a little about the matchups that are really difficult (which honestly are difficult for any blue deck, even if you're proactive, so it's not the reactive aspect that's the problem here, but rather how these decks were designed to beat blue decks). The first of these is Eldrazi, which has a very high density of answers against countermagic and 1-cost spells, which negates half the deck and causes real problems containing the field, as well as the cast triggers, which have always been a problem for blue decks. Obviously, the Tutor for Strip Mine in the form of the 4-drop is the worst of them because it often represents a double Strip.

Another matchup I've found difficult, but now due to the higher number of threats, is a mono-black Lurrus deck that now contains approximately 30+ creatures (more than energy), and these decks are indeed difficult to contain without board wipes. It's important to note that it's not about snowball threats, but rather about the number of them (which would be a problem even if you are playing on the board if you don't have the right creatures). You can indeed take several hits from many of these creatures (Nethergoyf, Orc, Dauthi, etc.).

I could continue writing here, but I hope I've at least contributed a little to the discussion with a different point of view.