I think the push for nodes has a lot to do with the division of services in the amateur radio world. You have DSTAR, Fusion, DMR, P25, NXDN, and even analog but not a ton of support for mixing different formats on the infrastructure level. Having hotspot/nodes alleviates that so if a ham wants to use his local YSF repeater but only has an analog radio or a DMR radio, they can access it via the network side.
That being said, one of the major downfalls to System Fusion and DSTAR has to do with the server dependency which almost makes it impossible to interconnect systems without some form of internet connection. Then you have your commercial standards like DMR, P25 and NXDN which only need an IP network in order to be interconnected (IP doesn't mean internet). IP networks (RoIP/VoIP setups) aren't a fad either as they've become common place in many public safety systems (for the better) and offer higher levels of redundancy at a fraction of the cost compared to the old ways which utilized expensive phone switches or manual failover.
If looking for a reliable repeater network that can operate independently of the internet (seeing the OP is in Texas), you may look into the Armadillo Intertie as roughly 80% of that system is still RF linked via full-duplex link radios (though IP is becoming more common with some state agencies providing transport via their statewide networks).