I think in this case it is a matter of size constraints. An e-switch is much smaller than a mechanical clicky, so this most likely keeps size as minimalistic as possible and still allows tail standing.
I got the new code for the 20% off. Its posted in the OP 
For some of us it look a little more than a few minutes, so be patient.
I got mine from GB using code TOOLNY it was $9.99. Received it in less than2 weeks from China. I Am amazed at the quality of this light. Great little light for those moments you just need a bit of light.
The link in the OP has a magnetic non-clicky tailcap that I couldn’t find on the Chinese websites, it was worth the extra few bucks to me.
You are correct, mine does not have the flat end or the magnetic feature. They are both useful items if you need those features. For my use it wasn’t necessary.
You can buy different tailcap on ebay or aliexpress.
Good to know
Is it strange that this tiny $20 light with only 110 lumens has become my most favorite light! It’s so small, light and versatile and the brightness is perfect for 90% of tasks. I want 10 more to keep 1 everywhere!