Concerns regarding shelf life, obsoleteness, price of iPads are valid.
iPad 1 is obsolete for music making.
iPad 1 wasn't really made for music making : low specs was more proof of concept (single core 1GHz A4 32bit, 256MB RAM).
IPad 2, mini1 (512MB RAM, Dual Core 1GHz A5) struggles with latest iOS8, 9.
It was only when 1GB RAM and Quad core graphics was introduced in iPad3 (2012) onwards
that music making became more viable on iPad.
A person with iPad 3 and iOS8,9 can keep making music.
Although I would recommend 64bit processor (Air1&2 Mini2&4, Pro) for 64bit iOS8, iOS9 :
most music making apps require iOS8, iOS9.
Ipad Air1, mini2 both three years old with their 64bit A7 processor runs fine for latest iOS9 as well as music making apps.
If a person is content with current apps & iOS9 they are good to go on Air1 (i have), mini2 for a number of years
... so long as the hardware holds up.
Air2, mini4 both with 2GB RAM & A8X, Pro 4GB RAM A9X processor more so.
Nevertheless this is the thing max music making usefulness we can typically expect barring exceptions is 7 years.
A hardware digital recorder, keyboard, synthesizer can be fine for decades.
This in itself is attractive.
Sheer convenience of putting iPad in a small bag
£7-£15 apps which would cost £70-£200 on Windows & Mac makes music making on iPad attractive.
It has replaced many Mac & Windows software 1/10th -1/20th cost for me.
Not to mention touch interface and availability of audio interfaces that work with iPad:
a large list is posted on this forum.
Moreover USB class compliant devices increasingly being introduced
making iPad music making more approachable.
iPad Pro, Air2, mini4 can be considered quite expensive for what comparatively little we get.
Mini3 is the one to bypass as it is near identical to mini2 whilst being a fair amount more expensive.
Still there are places to purchase iPad with 2 years warranty at £hundreds less : CeX UK, CeX USA.
To add I am aware
Obtaining essential elements from conflict zones
Paying pittance to factory workers that enable large corporations to earn £Billions to pass onto Venture Capitalists & Shareholders.
Whereas Apps have undoubtedly benefitted
the disabled, autistic, health impaired, free eye tests poor countries;
enabling App developers to provide for family, pay off parents mortgages;
small traders thriving from Apps whom otherwise mired in poverty;
employment for millions factory workers, advertisers, supply chain, sales & support staff otherwise jobless.
What to do since many of us rely on products from large corporations : clothing, food, housing, tech
What we do, don't do is upto us, just us.
I'm unsure whether we can foist upon others our own choices.