Even when they found success on Nintendo platforms during these eras, they just kinda went back to mostly exclusively sony consoles and kinda crawled back to Nintendo on handhelds. Just look at the tales of games, symphonia is one of the highest selling tales of games when it released on GameCube in the west and put that series on the map, and then they just sorta picked and chose which one they wanted on Nintendo systems.
There was also that tales of game that was on PS2 that got ported to 3DS, outperformed bamco's expectations and then they just kinda went back to sony again and just put more tales exclusively for vita for some reason
There was a time when Bandai Namco was putting a Tales on every single platform, PS1 PS2 PS3 PS4 SNES GC X360 WII GBC GBA NDS PSP 3DS PSV all got a title at least, the vast majority were even exclusive.
It didn't pay off, late ports irked the fanbase and they reverted to where their customers are in their main market Japan which are Sony home consoles.
Western markets were, until recently, an afterthought. When your game sell in the 500-700k range in Japan and you get 200-300k out of western market this is not hard to understand.
But then Nintendo picked up Symphonia and it sold >700k, Bamco chose to follow up by releasing their latest PS2 titles (Abyss, Legendia) but both bombed, they also didn't even make it to EMEA market afterwards (Bamco EU being almost non existant back then)
They tried to please westerners with a shiny new episode on X360 and while it didn't bomb it just sold a regular 270k number, on the mean time Symphonia DotNW sold more or less the same amount (230k) on Wii
Since no matter what they did (port, spin off, main entry) western sales would be similar there was no point taking western markets into account when choosing the platform from their next game, and since the mentality of going for exclusives still stuck in Japan, PS2 PS3 PS4 was just the normal thing to do.
There are various others anecdotes (like them trying to go on DS but failing to find success on the japanese market, Tempest DS localization apparently being cancelled despite being finished) but there's nothing impossible to understand in their platform policy for the series looking at the broader picture.
Symphonia GC western success also came too late, of their two teams making Tales games, one was already dedicated to PS2 (Destiny 2 Rebirth Destiny Remake) and the other (Symphonia, Abyss, Vesperia) had already switched to PS2 for Tales of the Abyss after Symphonia GC had lackluster performance while its PS2 port managed to sell more.
Speaking of Abyss, once again, the "outfperformed expectations" has been completely taken out of context: It sold below expectations (250k) in Japan <200k, and the "outperformed expectations" was only about EU market where the game was english only and had a meager first print that quickly went out of stock in various countries like France. After numerous reprints and when all was said and done it only sold 10k in France, a third of what other titles did (Xillia, Symphonia DotNW, Vesperia), so yeah it outperformed the very low expectations they had, that's good but in no way an argument that should be used the way I see it being used.