WLAN disable on a controller upgrade, why?

I'm confused. I'm about to upgrade a 5508 controller so I can do the pre-download to the access points, but in every doc I find, it says to disable the WLAN's before upgrading. This makes no sense. I'm just moving code over, why do I have to disrupt my wireless network in order to move code?
Thanks,
Eric

Steps 4(optional) and 5. This is from 7.0.230.0 Release notes. I believe I've seen this in several release notes versions.
http://www.cisco.com/en/US/docs/wireless/controller/release/notes/crn7_0_230_0.html#wp844121
Step 4 (Optional) Disable the controller 802.11a/n and 802.11b/g/n networks.
Note For busy networks, controllers on high utilization, or small controller platforms it is advisable to disable the 802.11a/b/g/n networks as a precautionary measure.
Step 5 Disable any WLANs on the controller.

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I'm not entirely sure to be honest, as I inherited this piece of equipment - it is someone else's work. I have the following:
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Hi,
I'm running 3 WLC 5508, 2 of them running image AIR-CT5500-K9-7-0-116-0.aes, one AIR-CT5500-LDPE-K9-7-0-116-0.aes.
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I would like to pick up the discussion again. I had to upgrade the 2 WLC's involved in the scenarion and the WLANs are staying enabled. The APs are registering in a perfect time at the secondary 5508 and so do the clients.
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Hi guys,
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Not in Bound state.
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interface   GigabitEthernet0/22
description PB-RS-A22
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switchport port-security violation restrict
switchport port-security aging type   inactivity
macro description cisco-desktop
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Thank

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http://www.cisco.com/en/US/docs/wireless/controller/release/notes/crn73.html#wp965532
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Using one VLAN over several WLANs without maxing out controller

Hi,
I need to provide several WLANs that need to have different SSIDs, but can all go on the same VLAN.
An example would be if i have 40 schools and one large, flat guest LAN that I want to use for them all. I'd like to put (SSIDs of)school0001, school0002, school000n etc onto this same VLAN without breaking my limit of 16 WLANs on the controller.
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The 16 wlan limit is hard set.
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"... limit the number of service set identifiers (SSIDs) configured at the controller. Based on your access point model, you can have configured 8 or 16 simultaneous SSIDs, but as each WLAN/SSID needs separated probe responses, and beaconing, the RF pollution increases as more SSIDs are added. The results are that some smaller wireless stations like PDA, WiFi Phones and barcode scanners cannot cope with a high number of basic SSID (BSSID) information. This results in lockups, reloads or association failures. Also the more SSIDs, the more beaconing needed, so less RF space is available for real data transmits. "
from
http://supportwiki.cisco.com/ViewWiki/index.php/Wireless_LAN_Controller_%28WLC%29_Configuration_Best_Practices
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WLAN disable on a controller upgrade, why?

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