Pretty much this. Mark got dicked over by Tom in both breakups. In 2004, Tom didn't want to record/tour and wanted to spend more time with his family (his reasons). Mark wasn't willing to record separately and piece together an album over email (went on record stating this, then did it anyways with Neighborhoods) so the band went on indefinite hiatus. Skip ahead to 2015 and Tom is stubborn once again, preferring to tour ($$$) over record new albums (DED being the only exception). Tom spends more time working on AvA content. Mark and Travis make Tom sign a contract with a strict deadline to work on Blink, Tom doesn't comply with the contract, Tom bitches out and gets Rick DeVoe to talk to the band on his behalf stating "Tom is out."
Pretty much the pattern is that Tom is stubborn and will only record when he feels like it, even if it means only recording 1 album and an EP in 6 years. Tom then turns into a pussy getting Rick to talk on his behalf and drags his feet on any productive negotiations or discussions with the band. Mark understandably got sick and tired of accommodating Tom and working around his schedule. Tom put himself first over the band, had ample time and opportunity to right his wrongs, but didn't. If I were Mark, I would have done the same thing. New Blink's music is definitely worse without Tom, though - so from the perspective of artistic integrity and developing their sound, it was absolutely a step backward.