Part 01
If this post add anything to your knowledge, Its my pleasure.
part 2
Change filters? Yes. Use Mitsubishi brand? No need.
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its not about brand just about filters.
See answer number 1.
I thought they were out of business. No matter. I’m still a little peeved over their POW use in WW II so I avoid that brand anyway.
Yes it is because it says to use genuine Mitsubishi oil filters . And they don’t make their own filters anyway .
And it’s not just filters either. Mitsubishi does not make their own brakes, clutches, lighting, wire harnesses, seats, interior trim, timing components, etc and even their transmissions are made by JATCO; a.k.a. Japanese Automatic Transmission Company which is also a supplier to other auto makers.
Same as any other car company.
How important are oil filters Maybe no quite as important as you think. My 71 VW did not really have one, just a screen that kept out most pebbles. In the 50s they were still optional on many cars and neither of my riding lawnmowers had one,
I can remember when I started driving, Chrysler recommended changing the filter every second oil change.
… and those engines typically needed a Valve & Ring Job by 50k miles.
The “Good Old Days” weren’t really so good.
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But most of engine problems in the old days was related to lead in the gasoline although I agree that lack of filters played a part.
Lead played a number on spark plugs. adherence to piston tops and valve heads which caused seating problems over time, and worst of all; contamination of the motor oil with abrasive particles.
Anyone who has serviced engines running leaded gasoline vs more modern era engine running unleaded can tell you of the time spent cleaning pistons/valves/heads vs the more modern counterparts. It’s a night and day difference and something the flat rate labor times don’t account for. Hours spent wire wheeling hardened, leaded debris that can be a 1/16" thick and more on everything up top.
Both my Roadrunner and Superbee had the 383 Magnum engines running on leaded gas and they needed higher RPMs to keep the plugs clean. Three weeks of driving in town meant bucking at 3500 RPMs unless the cars were given a short high speed highway run or the plugs were removed and cleaned of the lead deposits. And no amount of heat range or plug tweaking would cure this. Higher RPMs around town meant 6-7 MPG and more aggressive foot use meant 4 or so…
My “secret weapon” in my 56 Desoto Fireflight was 102 Octane Amoco unleaded high test, It let me run 12 degrees advance instead of 8, gave me more power, better fuel mileage and let me run one heat range cooler plug and ended plug fouling.
The premium gas at the station where I worked was about 96 octane. The 383 Magnum was a different beast even compared to the regular 383s and no amount of timing tweaks or even advance weight changes would cure it. On the open road it would get a surprising 17 MPG at a cruise. With the AFB floored one could watch the gauge drop. Street racing on a Saturday night would get expensive even at 35 cents a gallon for premium… 
Another disadvantage with the lead was that it created more problems with valve faces and valve seats. On an unleaded engine valve seats could be easily dressed up with a Rite-Way valve seat cutter and valve faces brushed up with valve facing equipment.
On leaded gas at identical mileages it could mean seat replacement or valve replacements; considerably more expensive than on the unleaded version.
“Is that imporatant”?
Is that a statement? A question?
Oil filters are important?
I too can’t believe how many hours I spent painfully removing lead buildup from heads, valves and pistons.
I remember being unhappy when lead was removed from gasoline, (all because of my stupidity), but for decades now I’m so glad it’s gone.
In my area, in the late '70s, there was a cadre of elderly men who were convinced that the advent of catalytic converters and the banning of leaded gas were both some sort of government conspiracy to “ruin their gas mileage”.
So, as the men in this group began to replace their older cars with those equipped with catalytic converters, they intentionally used leaded gas in those cars in order to destroy the cat and “improve their gas mileage”. 
… because anything that you don’t fully understand just has to be the result of a conspiracy…
I remember when they removed lead from gas and the havoc that caused with some vehicles using certain oil brands. Unleaded gas burns hotter then leaded gas and some oils at the time couldn’t handle the heat.
I’ll never change oil without also changing the filter. To each their own.