I graduated college recently, and late freshman into sophomore year a lot of my teammates discovered caffeine in pill form and started using it. the coach of the women's team got really irrationally upset about it and somehow compared it to nicotine (???). It all came to a head when she sat both men's and women's teams down in the film room to have our trainer give a PowerPoint presentation on the effects of caffeine.
To her dismay, the trainer simply presented the facts about caffeine and its performance advantages (for most people) and the meeting turned into an awkward situation where the coach and trainer were not presenting a united front. If anything, the meeting that she imagined would be a sort of drug intervention to get people to stop taking caffeine actually resulted in more people on the team taking caffeine before races.
I think the illogical disapproval of caffeine pill use from my coach, and I guess coaches on here, is that passing pills to each other at a meet and popping them before your warmup comes off as shady behavior to those running purists, so some coaches feel unsettled by it. People on my school's team have probably been getting coffee on race day for decades without the coach batting an eye, but once it became a funny thing about popping a concentrated pill, the alarm bells went off in her head.
I will add that a big thing that the trainer focused on was the mg amounts in various drinks, in relation to the NCAA's legal limit, which is 500mg. There is no way anyone at our level of the NCAA would ever get tested, even at championships, but I did understand the coach's desire for fair play. You would have to take 2.5 200mg caffeine pills to get to 500mg, which most of my teammates never did because you'd be bouncing off the walls out of control and probably not sleeping that night. There was only maybe one kid who took a questionable amount of caffeine pills before breaking the school record and qualifying for NCAAs.
However a large blonde roast coffee from Starbucks is 498 mg, so you could possibly go over the legal threshold there with one drink. When this was revealed by the trainer it became a big joke on the team to the point where some people would go out and "get blonde roasted" before meets or parties. Coach's plan really backfired.
Some coaches on here need to remember that even at the collegiate level, most of the athletes are kids and will behave like kids in response to authority. So trying to fight a war on caffeine in order to have control is not gonna go well for you.