Let me preface this by stating I watcghed TOS first run (starting witjh S3 in 1969 - I was 6):
TOS has not been consistent with the models (I'm talking the original version, not the Remastered version); and hell right off the bat you have Pike's crew with Lasers and not Phasers and WNMHGB has the Pike era Bridge set and viewcreen (it was the 4th episode broadcast in the 1st season) - so yeah, please tell me again how TOS was "always visually consistent".
Then there's the various 'time frame' differences - IE TOS S1 - "Tomorrow Is Yesterday" and "Space Seed" have TOS about 200 years in the future, while TOS S1 - "The Squire of Gothos" has it 700 years in the Future, and if you look at the date given by Apollo as in how long he's waited compared to the Greek era on Earth, TOS is a couple of millennia in the future.
As for TNG - given how HEAVILY it's retconned a lot of TOS, I'd call it the first reboot. And even it took a season to finally/definitely place WHERE it was in the 24th century. In the piklot, Data gives the year of his graduating class and by that the pilot should be taking place in the early 24th century (circa 2330 or so) - and it's not until the TNG S1 Episode "The Neutral Zone" where Data explicitly states the date as 2364 that they pin it down and seen to use that date going forward from there.
Then - in the first Season we have Worf claiming he was raised by a Human Starfleet officer on the planet Galt - a farming colony, and even mentions he started Starfleet Academy with his brother (who showed up way later in S7); but Worf does mention his brother hated the Acedemy life, resigned and RETURNED to Galt.
I mention all this because then in TNG S4 - "Familiy" (and going forward) - suddenly Worf was raised ON EARTH <-- And earth anecdotes for young Worf continue past TNG - "Family"....
I could go on and on to the other series, but yeah, sorry - Trek HAS NEVER been 100% internally consistent from day one; and to try and even claim "well, it's been close..." is laughable too because I could give you MANY MORE EXAMPLES from practically every TV/filmed incarnation <--- And again I say this as someone who loves Trek (especially TOS which is still the BEST in carnation hands down) and has watched everything - excluding ST: VOY <--- I couldn't take it past "The 37's", but that's me.)