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I just got off of a big LoRaWAN project for remote data collection.

Antenna elevation is your friend. At long ranges, be aware of the fresnel zone!!

Does it make sense too look into it for high speed data telemetry? Like sending a reasonably sized array of floats 50 times a second, or would there not be enough throughput?

Probably not. Best case you're getting a few kbps, but generally less - especially if you want long range.

Ah shame I guess what I've heard is true about throughput. With the almost gigahertz range frequency I'd have expected a more like roughly a third of wifi speed honestly, but I guess that's not the reality.

There’s a 2.4Ghz version that does higher speeds (up to 2Mbps) at shorter distances, but can fall back on slower speeds as well. It can’t get the same distance as the sub-GHz version but it’s still a nice product.

Short answer: nope.

Long answer: https://www.thethingsnetwork.org/airtime-calculator

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