Eh, it's perfectly viable. The average user doesn't give a toss about what 'powers' a website or app, they only care it does what it needs to. If a customised W

Eh, it's perfectly viable. The average user doesn't give a toss about what 'powers' a website or app, they only care it does what it needs to. If a customised WordPress theme is the fastest/most convenient way to get your MVP out the door, go with that. Go with whatever you're most comfortable with.