Questions and critics on SharePoint

I have rised a number of questions on friendfeed, but many of them remain unanswered.

• In Sharepoint WCM, I can create folders in the « Pages » library with SharePoint designer but not with the web interface. Why? Are there side effects?
• After an incremental crawl in Sharepoint 2007 search engine, are deleted documents supposed to be removed from the index? Any official reference?
• Why is the HTML code so invalid/ugly

Also, I have encountered bugs…; What’s the problem with:

• I try to import an Excel spreadsheet in SharePoint, as described in http://www.sharepointcustomization.com/wss…;. When I click the « Import » button, Excel does NOT open, I am redirected to /_layouts/ and thereby receive an « Access denied »
• When starting the standard approbation workflow, user sometimes gets « critical error » and Shapepoint logs refer to an « invalid canary ».
• Deployed a solution. Some time later, deployed an upgrade containg a updated DLL and updated master pages. Ended with stsadm -o execadmsvcjobs and stsadm -o copyappbincontent. But the webpart behaves like it used to with the 1st version. Any idea why? Why was iisreset required?
• Firefox is not supported in many scenarios

Also, what do you think about this SharePoint oddness:

• « starting date » is a Date and « end date » is a Date+Time