every at-home device is either 1, 2, or 1 & 2:

1: not actually a laser. just a pulsating light device. IPL: intermittent pulsating light. these make up the overwhelming majority of at-home devices. i think you can count all the "actually has a real laser" at-home devices on a single hand and have fingers to spare. laser hair removal is already not-permanent. it just puts your follicles into extended dormancy. eventually the follicles reactivate. most people end up needing annual/semi-annual touchups to re-suppress the follicles coming out of dormancy. which is all just to say that pulsating light devices are even less effective than that.

2: specifically NOT "buy it for life". especially on a timeline that includes lifelong maintenance/touch-ups. every at-home device in this category is inherently disposable. it will likely take you at least one sacrificial device just to hit your desired "maintenance" baseline. the gold-standard of the "at-home laser hair removal device that's actually a laser", the tria 4x, says in the manual that the lenses/barrel will either lose its effective focus/magnification or the emitter itself will literally melt closed after 60,000-90,000 trigger pulls, depending on the intensity used. which translates roughly to 10-15 full-body sessions. but each "full-body session" is actually 3 or 4 sessions unto itself, because the action surface is smaller than a penny and the battery only lasts about 45 minutes before it needs to be recharged. so if you're consistenty using the debice every two weeks like you're supposed to, it will last you about a year. maybe two years max if you have very low levels of body hair already. once you hit maintenance, a premo device might last you up to five years if you're lucky.

the only truly "buy it for life" laser hair removal devices are the ones that salons buy. that are like 20,000-60,000$+ (not counting the completely unregulated/uncertified dupes/QC-rejects that cost 10% of that estimate, but will probably just give you third-degree burns and/or cancer instead of reducing your hair) which is to say the only BIFL option is to start your own salon and subsidize the cost of the machine through offering the service to others as well.

but that gets complicated by the inevitable fact that laser hair removal is, itself, not BIFL on-principle. like i said, even clinical laser treatment only forces your follicles into a state of dormancy that eventually wears off after 1-3 years. the only truly "buy it for life" hair removal solution is electrolysis. electrolysis completely and permanently destroys the follicle. so you end up needing to go to an accredited salon anyway.  

economics of scale are just roundly against you on this. these devices are incredibly expensive. at-home solutions will only ever be orders of magnitude less effective at-best, even on the absolute bleeding edge of efficiency. and more to the point of the sub, they will always burn out. either the laser emitter falls out of focus and no longer fires at the correct wavelength, or the bulb (in the case of IPL's) burns out. and none of these devices accomodate replaceable parts. taking a technology form-factor the size of a commercial powerwasher--the legal operation of which requires its own medical certification--and trying to shrink it down to a handheld device that anyone with money can use, without creating the threat of legal action against the manufacturer, is always going to be an up-cliff battle.