Player paid his money, so he deserves a chance to cash - no matter how slim.
A player who leaves has effectively forfeited that (slim) chance.
The extra chips (2x an orbit) are as predictable as an ante. The advantage goes to the player that can adjust for the occasional ante that never comes out of an active players stack.
It's hardly an even playing field unless one pays no attention to position.
The advantage goes more to the players to the absent player's right (button and cutoff) who get to play for late position when his dead blinds are posted.
The players to his left (UTG and UTG) have less ability to steal these dead blinds.
It is consistent with a player stepping away from a tournament for a beer/smoke/shit or any other reason. Nobody complains about "fairness" when Chatty Kathy steps away to make a phone call.
This analogy is at best flawed and at worst dishonest.
There is a substantial difference between someone missing a few hands over the course of a long game and someone missing *every single hand*.
It's a widely accepted TDA rule.
Huge casino tournaments and one-table home tourneys are very different animals. Apart from the vast difference in the number of players, the former is also typically many times longer.
A good home host knows when to deviate from strict TDA adherence for the good of the game (also a TDA rule, right?).
Also: Some seem to ignore half of the phrase "home game." You step into someone else's home -- for poker or anything else -- you are a guest. It's a privilege to be respected, and one which the host can revoke if s/he wants to.
It does not require changing the rule if the game grows to two tables, 3 tables or even more. Stack has aways stayed in play.
The OP has not indicated any intention to host multiple tables.
It fits with the OP's desire to track stats. If absent player starts to last longer than he used to (before the sudden change of jamming with junk), player (and the group) may learn that they may play too aggressively.
The OP has specifically said that this behavior messes with their longstanding point system.
In the unlikely event that the player returns, he may still have chips.
Tough nookie. If you show up at a game knowing you don't want to be there, and acting that way, you can expect pushback.
An absent player is simply an uber-nit. I get that playing against a nit may not be fun, but it is legal - as legal as the jam, but less disruptive.
See my post above. Tanking 60+ seconds every street of every hand is legal, too. But it's not likely to result in future invitations.
Also, I find it interesting that you think the player on the absent player's right has the advantage (an aggressive player's mindset). I think the player on the left has the advantage, as they get to be last to act twice an orbit. So in a game with as little as 5 players, one is missing, half the table has an advantage - assuming the other two cannot adjust their games. Knock out one player and everybody has an advantage!
This is nonsensical. That player is only last to act when the empty seat *has no blinds in.*
As for shorthanded play, based on the description from the host, it seems unlikely that the stack would still be getting blinded off once they got shorthanded.
I've played a couple times in games where a stack was blinded off... It's just an annoyance that may please some people's love of abstract theory but in practice is a pain.
I will also add that in addition to the 4 instances I listed above, we allow a player to buy in late (~1 hour after the tournament starts). If they are still not there, they can Venmo us and we will put their stack into play at the end of the late buy-in period. This prevents someone from getting caught in traffic after an hour and missing the buy-in. This has occurred on multiple occasions, and nobody had an issue about "unfair advantage" (although, it has always been a very short delay).
Again, that's a different situation entirely: an occasional courtesy which happens once in a long while, and not for the whole game, is different than someone leaving behind a stack on the first level.
When I hosted tourneys (several hundred times), I would make reasonable allowances for unavoidable circumstances. Someone who needed special treatment every single game, however, was not going to last long on my list.
In short: I don't find a single reason cited persuasive, sorry.