When it comes to Poirot by David Suchet, and Columbo by Peter Falk, namely these two series...
https://www.tvmaze.com/shows/1166/agatha-christies-poirot/episodes
https://www.tvmaze.com/shows/466/columbo/episodes
...they are not typical TV series nor miniseries. They are literally TV movies.
With exception of first few Poirot movies which were around 60min, all other are typical 2 hour movies.
Would it be alright if I alter the seasons to instead be called "Season 1989", "Season 1990", etc. as is usually the case with such movie-style series?
I dunno what was the source for this, but it just doesn't seem correct to have movie from 1990 and 1995 and 2003 in a same season.
These are all TV movies. Sort of like Perry Mason ones that were added as specials only as not to separate them from the TV series.