Tosh,
Legal limit is 1.6mm across tyre so at 4mm your only half worn anyway,
The main issue on newer cars is the TPMS tyre pressure monitors,
Seen a few lately that have odd tyres on same axle and it keeps putting light on as it thinks one tyre is going down, but as long as tyres are changed in pairs its fine or if one is damaged for whatever reason it is replaced like for like (make and model of tyre is the same not just make as every tyre differs)
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04 XC90 D5 --- Big bus
00 pug 306HDi --- Run about
88 pug 309GTi --- Project track car
07 CB600 Hornet --- 2 wheel fun
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