Please take a little time to read over your message and spell check before you send. This was really challenging to read & decipher.
Snow/water/road salt can affect the tunnel structures, that's why reducing ingress is important.
I know the streetcars have sanders, but if they don't need to be used because the slope is covered/protected - even better!
Plenty of staircases and entrances across the city that have canopies over them - the TTC is working on removing the one at Dundas at the moment!
Maybe if they rebuilt the Spadina station portal today for example, we'd see something similar. Just because there is nowhere else in the city with this, that's not a reason not to do it.
An example of a really ugly utilitarian portal is this one in London - the Crossrail tunnel portal in Stratford. Just a concrete box that burrows into the ground.
(yes I know this is a mainline railway example)
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And portals like this is fine if the context doesn't require more (and in this case, it doesn't - it's not accessible to the public, much less being a major destination)