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I would avoid cross drilled holes because they introduce more areas that residual stresses and material flaws can result in fractures. Done right dimples and slots theoretically improve gas release at cost of slight reduction in surface area. Braking is huge for race cars. Some use complex rotor machining, some don't.
The aesthetic appeal is the link to high tech expensive caché. Sales of Brembos et al would be drastically lower if they did not have this distinctive high tech big $ look to them. Same reason Brembo offers their calipers in bright colors. M3s, Porsches, Ferraris, etc. have the 'look', so that can be worth emulating. I think they can look great if done right. In real world street driving I doubt I would notice much difference with slots or dimples. But I think they look cool and probably add a few $ to resale.
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