Technic, interpretation and refinement are all linked each other, I think.
One must have an idea about what the composer wished to "say" when he/she composed that musical piece. But also about we feel. Without our own feeling, we risk to be very "mechanical" or "artificial". In the other hand, sometimes most of the indications about tempi and dynamics does not come from the composer but the editors. For example, in the Chopin etude "tristesse", the tempo wanted by Chopin is a little faster than the tempi indicated in many editions...
And the tempo choosed by many performers, when performing the Etude nr 1, is faster than the tempo wished by Chopin...
When each one of us plays one musical piece each one of us is "making" Art. That`s why the same piece is so different played by different performs. For example, you may wish to compare Valentina Igoshina playing the "Raindrop" with Marta Argerich... the same music but so different...
Best wishes
Rui