You can of course use daisy chaining, using MIDI Thru. I.e. A cable out of ARP connected to Device 1 that sends the MIDI data out to Device 2 on the 2nd MIDI cable.
This has two potential drawbacks though. Some devices don't support MIDI Thru and many devices use what's called a "software Thru". In the latter, each MIDI IN message is processed and then resent via the MIDI Out.
MIDI data is serial and each MIDI message takes around 1 millisecond to process. There are a lot of messages to process so this delay can cause an audible lag.
If you have, for example, 5 devices in a daisy chain, the 5th device will take at best 5ms to receive the message. If you have a lot of MIDI messages it can take far longer and that may disrupt your music.
A MIDI Hub forwards the MIDI data, in parallel, to each of its MIDI Out ports. Therefore, each connected device receives the data at the same time.
For a small number of synths, daisy chaining is perfectly fine and you'll probably never notice any lag.
I often use a 1 to 3 Hub and daisy chain 2 or 3 synths on each output.