The BTH is not only helpful because of the relay server*, but also because it makes setting up a strong and secure VPN a simple task for beginners. We have seen people who simply disable firewall rules, to allow Winbox access from their workplace, for example. For beginners - just use BTH 
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- fun fact for technical people, in latest versions BTH actually has three modes of operation. 1) Direct 2) via the relay server 3) using hole punching. this means relay only helps to find both ends, but traffic will go direct.