Actually, with TES. Arena, Daggerfall, Morrowind, and Oblivion all took place within the same 50 years. Skyrim takes place around 201ish years AFTER Oblivion.
So Bethesda did made the huge 200 years jump from Oblivion to Skyrim but all of the other games are really between 10-20 years apart, at most.
Magic and lack of non-magical war.
For example, if you really want a proper evolution to take place in technology, especially for guns and other stuff. Then you really need specific reasons to do so. In The Elder Scrolls universe, the reason why Technology was never really developed throughout the times because there was never a need to do so. Everybody has access to some sort of magic and magic was the go-to for a lot of problem fixes. The continent of Tamriel as a whole never had any war which had magic disabled or at least the people part of the war (as a whole) couldn't use magic... Magic was involved in all situations as the primary cause of the issue and primary resolution to fix the issue.
Magic was used to start the Oblivion Crisis, for example. Magic was needed to stop it. Tamriel's technology evolutions never happens because of magic.
Now, if you want an universe which does have technology evolutions AND is magical? There are a few worlds out there like that. I believe the Fable series does it (but not a huge Fable fan so can't say much). Actually, the only thing I am fan of which has both technology and magic is the Fallout Equestria universe, which is a fan-creation that turned the normal MLP universe into this new Fallout Equestria universe.
Basically, technology evolution happened because of a war between two superior species on the same planet. Both species has access to small amount of magic but only specifics and can't access magic as a whole, like in an universe like The Elder Scrolls. Thusly, they had to work on improving technology and with a combination of both technology evolution and the magic they can use, they ended up creating a rather intriguing universe as a whole.
Simply, in order for Tamriel to have an technology evolution... Magic has to be limited (not unlimited) but since magic is basically unlimited, then technology evolution will never happened.